I invested 200k and received near 1mil.
I always thought the drafts primary goal is to provide great players for weak teams and not to generate money...
but you have to check if the investment in draft is better then buying a trainee, and let the other dudes draft.
Also i would ever draft the best player avaible, instead of one who fit my training because i could sell him and get a better one who could get training at my team for the money.