The only year I broke even-ish on my executive membership was the year I bought an expensive engagement ring. All other years I (household of 3-4) went below break even. I lived 1/4th of a mile across the highway from them even. I just couldn’t make it work.
Then why keep signing up? You clearly don’t need the bulk quantities, so why put up with that inconvenience?
To justify the subscription I made the commitment to buy all my necessities there that I could, and in return I get back the equivalent of a month’s worth of free groceries.