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I've always told my family I like to build up "cart karma." You get karma by bringing a cart in with you from the parking lot, or returning the one you use after. You lose karma by leaving your cart in the parking lot. Even if I'm going in for a single item, I'll take a cart in from the parking lot with me and leave it in the rack by the store.
I don't really care about cart karma, it's just a way of saying that it seems like the nice thing to do.
st peter at the pearly gates: "yup, looks like you're up 14 carts overall. welcome to heaven."
All sins and virtues get converted to cart return equivalent.
"14 carts positive, plus those 4 times you helped old ladies cross the street adds 12 more carts, minus 8 carts for the time you tried to help one but ended up punching her instead (it would have been 10 but it's reduced by 2 because Dionysus was watching that one and said even he would have had trouble holding his temper and he's a pretty chill dude). You're up 18 carts overall, congrats!"
"update, your next of kin bought 2 model golden shopping carts from the temple and put them by your gravestone, getting you to a nice round 20. here's your all-access pass to the Garden of Delights"
I do this by necessity because the medium-sized carts are most popular and they're usually only available in the parking lot anyway.