I've been out of shopping for a few years and thinking about going back to it. Why would anyone do a shop that doesn't pay you for your time and efforts?

Maybe I'm getting fussy in my old age, but I expect a [proper] fee to go, all my expenses reimbursed in full, and my bus fare. (I don't drive so don't ask me to figure out mileage.) And not interested in buying something I can't use or return. In exchange you'll get a well-written and accurate report.