There's coins to collect anyway. I mean yes, it can be pretty boring to go through 50cc but what completionist grinding isn't a bit boring.
Going just through 200cc and completing it at all is a bit meh - granted it will still take a lot of time and attempts to do it anyway.
I know I can just make myself to go through 100cc and 150cc first but it feels a bit forced. If at least there was a small reward, like art, for 3 staring each class (even if they are achieved by stacking), it would be more of an incentive to go through some of the lower classes first, in order to get some of those faster.
No big deal, though.