I think the idea is that financial rewards people who
a) Draft
b) Train their draftee's
Even if you dont full train ur guys, like Rex on my team only has starter potential, but i trained him be a decent enough backup at SF/PF.
Logically, the idea is that fans will go and watch teams who
a) Win
b) Have local players
c) have players they drafted.
its a fairly simple idea really. It suppliments the notion of training local players for U21, as well as encourages users to use the drafting system.