The more we talk and try to find solutions, the more I see how bad the game is or became to be honest. There are so many possibilities to cheat the system, one is gone and others will remain, new will be discovered.
Maybe the game just needs a completely fresh start. Like Pricop wrote, we will face the friendly mutants so many seasons from now on, there won't be a normal state of the game without all of this for the next year or so.

@lalexrus - I just meant restrict negotiations, not auctions. In auctions you should be able to buy 3 star players and train them, but not in negos. Negos should be for 99% quality players period. And like I said, only able to buy from teams the same level or higher. Upselling would be gone, because you cant sell a player from a lower level account to a higher one. It is that easy and still they haven't implemented such a simple feature to improve the game yet. Honestly this is just sad.