Well tbh, not so true, flashing and playing with phones can easily brake it, seen it before with a psp and a nintendo, both not mine either nor did I even chip/hack them as I wouldn't + don't know how, after a while the psp broke, it stops from time to time and switches of, the nintendo on the other hand just crashes at the screen.
after a while things do break, but some things don't sometimes you get lucky sometimes you don't, just like me, I plugged my removable harddrive in my ps3 along time ago and it wiped it clear, why? don't know. But I went mad.
Going past warranty can damage things, and if it does get damaged, you can't return it, and it's worthless unless you sell it as broke on ebay and get 20pound.
Anyhow, I would love to jailbreak mine but it just never does it, I have tried researching and so many people have the same problem, all I can do is wait till their is a itouch firmware update so I can update and then crack it with jailbreak.