It really depends on the person Doc. My father has a COSTCO nearby him in Va, and he absolutely loves the store. See if they have a trial or one-day pass so you can get an idea of what products you'd regularly buy from them. The big deals don't happen all that often, though they are good when you get them.
As jdbic said if you go there regularly you will definitely benefit from it. Oh, and my pops LOVES their bakery, esp. the pies. THough I'd never buy from them, as it would be a mortal sin for a chef to buy baked goods
**edit**
It looks in hindsight that you aren't near a B&M store eh? THen I say it's prolly not a great idea...