Funny that you mention that. eVGA's lifetime warranty, isn't exactly a lifetime, but a lifetime of that particular product. Say for example, you have an OC'd 6800GT and it toasts on you. eVGA will replace that for as long as they are still selling that particular model, which is probably less that the 3-5 you stated anyway. So know you know, and knowing is half the battle.
First off, this topic is in the wrong area.
Secondly, why don't you show me where it says that on eVGA's website? I coulda swore it said for as long as the original customer has it in their possession.
As far as lifetime goes, a lot of folks end up "handing down" their main rig to their kids, a family member or a charity cause. If something fries during its time with you, and you have an eVGA product, you'll get it replaced with either the same type of card or something better.
I'm sure eVGA comes out for the better in the end because of all the folks that just get rid of their computers when they buy a new one. Sure, Lifetime from eVGA is more marketing than anything, but it's sure nice to know that warranty is there just in case.