After checking my transfers with regular botteams (not advanced), I saw they got approximately 200K-400K to bid on players, which was enough in seasons 1-4, but now it seems that every "normal" old player's value is about 800K-1M, so it's results that those players are almost impossible to sell.
But if we can make botteams being able to get more money, (maybe allow them to get TV rev as regular teams, stop pay the bot manager salary ( which is huge according to help), give them compensation for not being able to build buildings), but how is less important now, then maybe we can promote the activity in the transfer window.
For example: if someone would pay me 1.5 for my 3 players I tried to sell, then I could buy a young striker, the team that sold the young striker could buy another player and so on.