...If someone pays somewhat over the odds for my player it is not my problem. I should get to keep the money.
...prices should be adjusted in extreme cases, or where there is obvious cheating going on, such as transactions occurring repeatedly between the same teams/IPs for inflated prices.
That is exactly how it works. If you are not colluding with friends to transfer money around, and you are not trying to bait newbies into bidding 200k on garbage players,
you have nothing to worry about.
Regardless of what it may sound like people are saying to you, if you are not doing those two things, I think you should just relax and enjoy playing the game, because no one is going to fine/ban you.