I've always wanted to make this topic on MFGG, but usually this debate ends up in a hopeless flamewar on other forums. I'm thinking we're civil enough to handle it, though.
Anyway, I've started using the Anti-Decompiler and Compressor on all my games released since the start of this year. I don't really care if some cheater really wants to see my mediocre coding - the main reason I do it is to shrink the game's file size.