Its been about 15 months since I got my XL BGE. My gasket burned off about a month after I started using my XL and I've never replaced it. I've done everything from 9 racks of ribs at a time, 30 pounds of pork butt, two briskets during a single low and slow cook with no ill affects. Everything came out beautifully. In fact, during my pork butt cook the butts went 16 hours and I had people over about 20 hours after I lit the charcoal, opened the vents and did some burgers for everyone without a problem.
Now sometimes I think I should replace it, but I can't imagine my BBQ coming out any better. I'm actually starting to get a reputation in the neighborhood as the house that if invited to a BBQ you most definitely want to come to it.
So I ask you Eggheads, why replace the gasket? Sincerely, convince me to do it, cause if I am missing something by not having one I certainly want to correct the issue.