Seller lists and recycled inventory: why the same sites turn up everywhere

The same publishers turn up in every vendor’s list because the pool of sites that sell links is small and the sites in it sell to everyone. A publisher that wants the income lists itself on several marketplaces, answers every agency’s email and ends up in spreadsheets that pass from one seller to the next. Vendors who do not do their own outreach all buy from that pool, add a margin and present it as their network.

This lesson explains how the pool forms, what recycled inventory costs you and how to tell when a site is on the lists.

What a seller list is

A seller list is a table of websites with a price beside each one. The usual columns are the domain, an authority score, a traffic estimate, the topics accepted and the fee. Lists arrive by cold email, as a shared spreadsheet or as an agency’s “publisher network”.

A marketplace is the same thing with a search box and a payment system. The mechanics are covered in our guide to link marketplaces. This lesson is about why the contents overlap.

Why the pool is small

Most websites will not sell a link. When Ahrefs contacted 450 sites across nine niches for its 2024 study, 12.6% were willing to sell a link insertion.

Among the sites that do sell, few are worth having. BuzzStream’s June 2026 study of about 257,000 guest post sellers found that only 1.37% reached a basic quality bar of DR 65 or more with at least 10,000 monthly organic visits. It rated 96.2% as low quality.

Put those together and every careful buyer is chasing the same few hundred sites, while every careless one is sold the rest.

The pool shrinks again in restricted sectors. ESBO’s September 2026 analysis of 16,625 publishers found that 41.5% accept gambling content, 35.4% accept CBD and 15.9% accept adult content. If you work in one of those markets, more than half of the sellers are closed to you, and the ones that remain already carry your competitors’ links. Our iGaming hub describes how that plays out.

It also shrinks by language. The same ESBO analysis counted 250 Swedish publishers, at a median price of $1,440, against 1,086 German ones. In a small language market there are only so many sites to sell, so overlap between vendors is close to total. See international link building for more on local pools.

How one site ends up in every list

Publishers list everywhere. Listing on a marketplace costs a publisher nothing, so a site that sells will often sign up to several. Practitioners report that many publishers appear on five or more platforms.

Resellers copy the lists. A middleman collects sites from marketplaces and other lists, adds a margin and emails the result to buyers. Setproduct’s September 2026 guide to guest post red flags gives a working rule: a seller who offers five or more sites in one pitch usually owns none of them and takes 30% to 50% on top.

Agencies resell each other. In a white label chain, agency A sells you links that agency B placed through marketplace C. That is three margins on one publisher fee. BuzzStream’s June 2026 data shows the effect on price: a guest post averaged $295 bought direct and $461 through a vendor, a markup of about 56%.

Catalogues are padded. BuzzStream counted 39,399 sites classed as news sites in one marketplace and pointed out that there are not that many news sites. Much of what fills a long list was built to be sold.

What recycled inventory costs you

You pay more than once for the same access. The publisher’s fee is the same whoever orders. Each layer between you and the publisher adds cost and adds nothing to the link.

The site carries a footprint. A publisher that sells to every buyer ends up with outbound links to casinos, loans, software and dentists from the same blog. Google is reported to have said in December 2022 that its SpamBrain system detects sites used to pass links on. When that happens the link stops counting.

You gain no ground. If your competitors hold links from the same sites, those links do not separate you from them.

You cannot hold anyone to account. A reseller who does not control the site cannot fix a removed link or a changed attribute. That problem is covered in link seller scams.

How to tell a site is on the lists

These are working checks from publisher vetting, not proof.

Signal	How to check it	What it suggests
A public price page	Look for “write for us”, “advertise” or “sponsored post” with a fee	The site sells to anyone who asks
Listed on several marketplaces	Search for the domain in two or three catalogues	The same slot is offered to every buyer
It arrived in a batch	The cold email offered several sites at once	The sender is a reseller
The name was hidden	The seller named the site only after you replied	The seller expects you to reject it on sight
Off-topic outbound links	Open five recent posts and read where they link	Placements are sold across unrelated sectors
Off-topic rankings	Check the keywords it ranks for in an SEO tool	A technology blog ranking for casino terms sells links
High output	Count posts per day	Five to fifteen a day across unrelated topics points to a content mill

How to vet a publisher turns these into a scoring method.

Recycled inventory inside an agency

The same problem appears inside a single vendor. An agency with a fixed set of publishers will place client after client on the same sites, and it may place you on a site twice.

Three habits catch it. Keep every report and compare the domains in each new one against the old ones. Ask, for every link, whether it came from outreach, a marketplace or a site the agency controls. And track two numbers over time: the share of your links that sit on marketplace inventory, and how many of your publishers also link to your direct competitors.

Auditing vendor deliveries gives the full routine, and the link building services comparison notes what each vendor says in public about how it sources sites.

When a listed site is still worth buying

A listing is not a verdict. Real publications sell sponsored articles too, and some platforms check their inventory. Collaborator, for example, stated on its site in October 2026 that it had verified Google Analytics data for more than 8,500 sites, as our Collaborator desk review records.

The test is the site, not the list. If it has real organic traffic from your country, covers your topic, and does not link out to everything, the fact that it also appears in a catalogue matters less. Buy it at the lowest margin you can, which usually means direct.

Where to go next

Read how to choose a link building agency for the sourcing questions to ask before you sign. Terms such as link insertion and white label are defined in the glossary.