It's funny and irony, a programmer offers their services or software to crack bitcoins with some money. So why don't they crack Bitcoin themselves, I'm sure those crack software makers will get more profits.
They might not have enough hardware (or money for said hardware, don't you need in the order of terabytes of memory at this point?) to grab the remaining keys so they're better off selling the software.
Isn't it better to just give the code but have some % of the profit? Even so, when you get a code for finding private keys you gotta check it a few times to not get dumped, cuz it might be listening for you to find it, and then sweep the key to the maker of the software before you manage to do it. This "challenge" might be a great opportunity for making a botnet search for keys.