Ideally yes it is achievable if you run a good budget and train players and make smart purchases but in general I think you are overestimating a good majority of the managers.
So the fact that the majority of the managers cannot make a halfway decent plan of managing their team is some sort of a mitigating circumstance?
Without doing any major planning, if you just buy a 'stick' and train hard for a full season, you should be able to make a million off that player. Adding 2 levels to 4 skills is achievable. That means buying a quadruple average player and selling a quadruple strong. You do the math.
Of the 6 players you train, keep 4 and sell 2, and this is 2 million right off the bat. With some careful shopping and drafting, the profit should be even better.
The case in point is that the profit from training should and does dwarf any sort of gate receipt revenue. And if any manager thinks that they can make money and prosper with gate receipts only, they're up for a rude awakening.
Or to trace back to original topic under discussion -- the fact that some guys have no clue how to manage their teams is not a legit ground for the argument 750k into some sort of a gigantic sum.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."