This is hilarious to me. You would wait longer because nobody is paying you to do your shopping?

I am picturing the hand model from zoolander, with the glass protection orbs, making someone else do absolutely everything for them.

Absolutely. If they're not going to take the cost of the labor off my bill then I'm just doing them a favor by letting them hire one less cashier while shifting an unwanted burden onto myself.

The worker scanning and bagging my groceries is a service that makes my shopping experience more pleasant and less taxing on me. I'm not giving that up in exchange for nothing.