My apologies for being not clear enough... I meant the resulting players. What is the selling price difference between 2 to 3 skill pops?
Hmm that is a tough question to answer. There are many factors involved, such as which skill(s) have popped extra 2 or 3, the overall balance in the skills of the player and so on. So the selling price difference could vary from unchanged, to perhaps by as much as $200k?? Well I really don't know, these are just my wind guesses. If you're training to sell, then I think lvl 4 trainer is sufficient (if that's your plan).