If you have finitely many problems, after purchasing finitely many copies, there should only be one problem left. If this problem isn’t solved with another copy, you’re out of luck and have to come up with the solution yourself.
If you have infinitely many problems then you shouldn’t complain, for you’ll solve infinitely many problems per copy.
How’d you solve the last 25%?
If you have finitely many problems, after purchasing finitely many copies, there should only be one problem left. If this problem isn’t solved with another copy, you’re out of luck and have to come up with the solution yourself.
If you have infinitely many problems then you shouldn’t complain, for you’ll solve infinitely many problems per copy.