"does google penalize link sellers?"

[GimmickTadpade]

"Do you believe that Google imposes penalties on websites that engage in selling links, even if these penalties are not explicitly indicated in Webmaster Tools? If so, what kind of penalties might be applied, and how can website owners identify and address these issues despite the lack of direct notifications in Webmaster Tools?"

[GimmickTadpade]

I think this is further proven by Bing getting rid of their disavow tool. At worst they will just ignore those links automatically unless you are involved in something so egregious omegle shagle owegle you get yourself delisted.