I'd guess that the people at Stack Overflow might have an issue with someone using their name in this way. It should probably be clearer that this is entirely unaffiliated.

100+ reputation on SO is also a ridiculously low bar, it's almost meaningless. Not that any amount of reputation by itself is a sure indicator, but 100 really doesn't mean anything at all.

This kind of site also requires a pretty large critical mass to work, you don't just want a bunch of random SO users willing to participate, but you need the right users with experience in the right tags to match to the requests in a reasonable timeframe.

There's a good reason Stack Overflow doesn't allow people to pay for answers, people already cheat enough for meaningless internet points, this will get much worse with real money on the line.