Being a paid subscriber and able to play in private games will not give any more minutes to players being trained. Nor will they be injured if they get injured during the private match. Atleast from what I read a few weeks ago. But yes...im sure alot of managers train up their young guys and make huge profits. I've done it a few times but lately I'm just training bigs...centers and pfs. May go after a Sg in the draft and combine him with my bigs next season. I'm probably no different than anyone else. I'm AM keeping a few of my young guys and will eventually sale off some trainees after they grow some for profits to invest in arena or another big time player that will be with my team for awhile. I've had a loaded roster that almost put me in division 3 but all my guys were old and loosing they're skills....it's a hell of alot more interesting building my own team up.
I may be wrong about the extra minutes from privey matches but I understood it to basically challenge your best line ups for bragging rights lol