I've lately returned to gummy bears as potty treats, since Alice has decided to SELECTIVELY abandon her potty-trained status. Amazingly, my big kids kept eating the potty treats, no matter what I said. The little girls are totally capable of saying no to themselves in favor of the rule—not so, the almost-adults.
I told my big kids, "Anyone who gets into the gummies again, has to buy me a whole Costco bag." Like everything else, they completely ignored me. Over and over, all three of them!
When they got home I informed them that all three of them had to go to Costco TONIGHT and each buy me a bag of gummy bears. (Can you fathom that quantity???)