Nope, the bugfix is only $50. The other $49950 is for knowing which line to change. (adapted from old joke from https://allthetropes.fandom.com/wiki/Percussive_Maintenance)

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.