Sorry man, but you are flat out wrong on that.... take the xbox (classic) controller for example... it's traces are so thin that it's very difficult to use. On the other hand the madcatz pads for the xbox are practically built for hacking.
They use the SAME chips for most third party gamepads as they do the originals. And yes the pcbs are cheaper, that's the point. Instead of high end "micro" pcbs with very tiny, non-hackable traces, you get pcbs made with older tech, which generally have larger, thicker traces.
I can only assume that either you've never hacked any third party pads, maybe you've hacked a single one and just happened to get a dud or else you are just making things up.
For the record I've NEVER had a third party pad malfunction on me, and I'm very hard on controllers. I've had the sticks wear out and get a little wonky, but they still function.