I have noticed that the cashier's have gotten pushy about asking about a Prime account, and very recently about a charity donation. It's a good way to 'make' people donate when asked upfront. I'm sure the probability of people donating increases. When I denied, I was asked if I'd like to round off my payment and have the balance donated. Honestly, it's very annoying. Whole foods is unfortunately becoming an REI store…
You got tested on this.
Prime account is just the replacement for their rewards program. For the month of... may? The old one who stopped and the prime one hadn't started. This made some customers mad.
Plus it's a lot easier if you're basically running off a script to do the eight hours of repetition.