In the morning at 5-6 am GMT there's usually a handful of expensive fast trainers dumped onto the transfer list. I guess it's different for each server. Half my squad are these early morning transfer buys. I got an 8 million 18 yo central defender yesterday. That's 3 mil more than the other dearest players in my squad. The price has gotta mean something. Of course just because someone trains fast doesn't mean they're any good come matchtime. I've had a few fast trainers who average 5 ratings. On the other hand I've got an early morning buy central midfielder who trains fast, scores once every 2 games and routinely gets his hands dirty in defence (his game ratings are all over the place but he does get 9 and 8's, just he also gets 5 and 6's) And I got a defensive midfielder to fill a role that every player before had failed at.