Even when they get decent coders for the base code, feature creep eventually wrecks the system. I know someone who helped write the POS system used in Disney parks, and according to them the system they originally built didn't suck nearly as much as the system I used as a cast member, and it's the hastily tacked on bullshit (causing the initial competent team to quit) that ultimately broke it. That said, I do realize that most people will not admit to shipping shoddy code in the first place.