Obviously I agree (check out my page of teensy executables sometime), but it's much more complicated to compete on that metric. The size of a compiled executable can vary widely depending on details of your compiler and/or platform, making for a very unportable challenge. In a monoculture world, that would be more practical, but that's not how things are nowadays.

However, I will say that trying to minimize the size of the source involves much of the same kind of resourcefulness and lateral thinking that minimizing executable size does. So despite the drawbacks, it really is just as fun.