I think things are too cheap in this game - especially once you've maxxed out your facilities and have the best drivers and staff you can afford.
In my case I'm earning millions every race, I'm replacing every part on the car each race, and I have the best drivers that my level (9) will permit. I don't know what else I can spend my money on. I've got 118million in the bank, and it's growing by 1-2million each race.
In addition, I don't bother with marketing because I want to use the staff allowance for designers and engineers...and I don't need the money that marketers bring in.
So - are things too cheap in this game (especially once you have a "mature" team) or perhaps income is too high?
Whichever way around it is, I think that it would add another element to the game to have to juggle finances too. However it's not something I've ever had to do, which is a shame.