I just want to do some math and clarify my previous wall of text. From my experience, it takes about 100,000c to comfortably finish the game. Let's say we want about half the credits (50,000c) to come from tasks (and super cups) and half from races. There are 24*4 tasks and 3*24 super cups. This means the average payout for each should be about 300c. Let us also say, it should take about 100 First Place Equivalents (FPE's) to finish the game. This means each FPE should be worth 500c. Cheers, it is a fun game.
There is still too much grind. I think the fun of the game is building and modifying cars. The racing is a nice touch, but, the fun is in the cars. You have level caps on items and other restrictions, the winning amounts should be opened up more. Also, it doesn't make much sense having level 24 give the same payout as level 1.
I just finished all the super cups on flying mode, and have the high score on kongregate. Looking at the leaderboard, I'm guessing Chaos2000 is just finishing the no-fly no-restrictions super cups, and a handful of people are in the middle of those. It shouldn't take 11 days to finish the game. I think this shows that the game should still increase the payouts.
It took me 95,543c to beat the game. 95,543c-4*24*150c(Tasks)-3*24*250(super cups)=63143c from races, at 200c a first place, that's about 316 1st place races to finish the game.
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Man, you are cool! I'm making Dream Car Racing Evo!