It's not a "scam" per say. Google has established these rules to prevent the commoditization of PageRank. They want links to represent an editorial choice and

It's not a "scam" per say. Google has established these rules to prevent the commoditization of PageRank. They want links to represent an editorial choice and indicator of quality, not marketing budget. There is nothing wrong with selling ads and visibility on your site to companies that wish to purchase this, but you should nofollow the links to prevent running afoul of Google's TOU. Again, I don't care if you sell links on Fiverr and make a million dollars. I'm just explaining the rules to you.