Since I've only had my BGE since April & the gasket burnt through, I thought I would contact custom service via email. Here is their reponse:
Sorry for the trouble, we'll get that gasket in the mail. There is a lot
of good information on the forum, but there are some nutty things as well.
Rutland does not recommend using their gaskets around food, so do your research
before you make any decisions. High heat cooking is great, but you want to
limit the amount of time you keep the grill in that zone. Most people don't
realize that a dome temperature of 700 degrees is 1200 degrees at the cooking
grid level. That is why we recommend flipping the plate setter over and cooking
pizzas at 500-550 degrees. Your pizza will still taste great and it is much
easier on your gaskets. Honestly the only thing that changes is the amount off
cooking time is extended by a couple of minutes. Ultimately how you cook and
the temperatures you use will determine how long any gasket will last. If all
you ever did was direct grilling, you would not even need to have a gasket on
the grill, but it does protect the rims from impact damage and help keep
moisture in the grill.