I'm not saying you can't notice that the market overprices JS or something and decide to start training/selling monoskilled JS'ers to turn a profit on; I was referring more to people who repeatedly take players with no business being sold for even 1k and decide to list them for 200k in the hopes than some new player will make a mistake and waste his money on them.
The point was that of the possible things he could do to get himself in trouble, scamming newbies is probably riskier than just simply buying/selling players over the TPE because you think that is their fair value. In the case of scamming newbies, you know it's not fair value, but you're exploiting the fact new people don't know that. Whether that is something you can actually get in trouble for or not I don't know, but it seems like poor sportsmanship regardless.
Also, not that you were making this point but I've heard other people make it, the idea that tricking newbies into wasting money on way overpriced players is some sort of 'lesson learned' teaching moment is lame too; newbies are going to make plenty of mistakes along the way as it is, I don't think it's good for the game in general to trick people into wasting good money on worthless players when they are just starting out. People who use that excuse are just trying to justify their own fairly mean-spirited attempt to make a quick buck.