I think, that many people support spam themselves, especially in comments, when they are responsible for all comments and even vote for them. Maybe we should stop voting for comments, and you will know, who are really interested in your posts and who is chasing profit. Although, sometimes I read the post and think "Cool post", but I try not to write it, because it is also a kind of spam. And it just pisses me off, when people in comments ask to vote and follow in response