~$500 a week on groceries is pretty high. I bet that covers almost everyone, unless people are buying hundreds of dollars in fancy meats and seafood and stuff every month.
I'm kinda in a gray area, I actually use almost all my grocery spend for actual groceries, just at a store that doesn't code as one (Fred Meyers, though I hardly ever purchase home/electronic goods there, just food, they have a good produce and vegetarian selection).
Then occasionally I'll pay my car insurance using a gift card and maybe my cell phone bill or something... but I'm way under $25k/year. Probably ~$8500 total; hopefully that isn't enough to piss off Amex.