You seriously think THAT MANY people would have done the JB via iPad BB upgrade in the first place AND then had warranty issues? It would be a very small amount and Apple wouldn't be out on a, as another poster described you as saying so perfectly, manhunt to catch people that had done it.
"Someone" walks in with a faulty mic but an iPad BB on their iPhone. Genius says the situation. "Someone" then walks out with exactly the same issue as before which they can get fixed through a repairer anyway for not too much and both someone and Genius go on about their daily lives.
Judging from the posts I've read of yours lately on these forums you've either got a God complex or you think every other poster on here is a moron.