$50k-100k seems a bit high for a bugfix.... else I'm desperately undervaluing my worth in salary negotiations
And in practice, it also "buys" you all of the other bug fixes and releases from helping to fund the developer. So while the bug itself might only take a day, the infrastructure around being in a position to do that takes much more time.
If anything, it'd probably exceed expectations.
I want to live in the fantasy world some of you live in where you expect corporations to cut you a $100k check, no strings attached.
Also, I've seen companies cut larger checks for sillier things with minimal conditions, so...
And yes, this would be the only voice they get in the development process. Why shouldn't it be? Apple's had a 12 year free ride so far.