I don't know if there is a solution too.
For example, the BBs could add a tool which detects every transfer which is a X % higher than the TPE given for that player, but the staff will get loads of false positives. This is definitely a waste of time.
It's really good to see that the community is thinking about how to catch cheaters, but every suggestion has his pros and cons. But maybe it's a better suggestion, that every manager who's brainstorming about a solution, uses his time to search the TL for cheaters. I'm pretty sure that we cach more cheaters in this way.
When I run into an invisible spider web, I instantly become a kung-fu master.