Nope, it's the gilbuyers. Easy to spot by the average Joe. However, SE thinks we people still believe "it's difficult" to do something about it.

Long story short: sellers will keep on advertising in a heavy buying server (like yours). SE will not (perma) ban buyers because they pay sub. They might ban a few bots so it looks like they're trying. In the end it all comes down to $$€€.