@Pennies4Shops
As it happens, the Walmart Supercenters are shopped in my community. Perhaps it's a competitor shop, the reimbursement is lower than the store I shopped.
However, the circumstance I'm referring to was a different grocery chain. I first had to circle the store and count the employees in each department, taking note of how many were interacting with customers; then make a second trip around the store to interact with employees in several specific departments. Finally, evaluate the cashier & bagger while watching to see if there was a manager at the front of the store. For me it was more work than I wanted to do on a single shop. The normal pay for the shop is $5 and the reimbursement is $12 for a total of $17. In that case I received a $33 bonus, taking the total to $50. It was enough to convince me to try something new. I tried it, and wasn't thrilled with it. If I did a few more of them perhaps I'd learn how to do them efficiently and wouldn't shy away from them.
Today the offer from the MSC maxed out at $50 total ($33 bonus). That wasn't enough (today) to get me motivated. I probably should have taken it, if only to force me to get up from the computer and get my lazy body in motion. From the point of view of the MSC I'm more greedy than hungry. On another day that may change. However, I think I can safely say that for those grocery shops, a $33 bonus is probably the maximum they'll pay. So perhaps I've learned one thing today. If so, it's not a total loss.