And to be honest, if my screen cracks - nothing to do with rooting - my phone mysteriously comes up missing.
But I wonder how many warranty claims are really because the phone was bricked (which is pretty hard to do, although a lot of people don't know what they're doing) or overclocking fried something. And you have to read the fine print because it's not like they tell you rooting voids the warranty when they're pushing that add-on. Unless I brick my phone or fry the processor, I feel entitled to collect the warranty. ESPECIALLY if they continued accepting my payment - I'd throw a hissy if I tried to make a claim and they said "sorry, you're rooted". If they know you are rooted, then they should cancel your insurance. Such a scenario would make for an interesting lawsuit.