Remember also that age influence the training speed(18-22 being the fastest ). If you buy a player age 20 after 2 seasons it will be more difficult( if not impossible) to have him gaining a star each season to compensate the one he lost going to upper division(fast trainer - slow trainer will be the second parameter). That's why buying your young player from academy( as long as you time it to arrive at the beginning of the new season) is great, because they are very fast trainer and you can easily get them 1.5 stars on one season. They arrive 4* and you can make them scout( or almost) for 12+ tokens..... On poor server it's a bargain!!!!