Let's stay a little basic:
+Exclusive Giveaways!
+Easy way to directly communicate with EVGA
+"Idea contests" for new "features" on products and if your Idea gets picked you'll get one of the products for free
+Higher availability for products that are new, hot and wanted! (queue system?)
+Premium Support
Some other stuff mediocore ideas:
+Able to visit EVGA HQ
+Exclusive Meetups/Partys at Event
+Interaction in the Podcast?
Ok outta ideas now, what do you think?