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Costco’s good even if you don’t need bulk stuff.
I’ve no knowledge of US stores and all that, but as a general rule, I’d be extremely suspicious of anyone offering so much cheaper gas as a rule. Also, free flights? There’s something rotten almost always, when the deals sound almost too good. There are no free lunches (in capitalist societies at least).
You pay a membership to shop there. This subsidizes many things.
They have membership fees (like someone else said), and also have lower margins than other stores. I think their margin per item is around 14-15%, compared to supermarkets which are over 20%.