Every shopper has a different background and may have a different goal in mind when it comes to MS. Fore some, it may be all about the money. They are likely to grind out long routes of gas stations and banks.
For others, it may be more of a way to bring fine dining back into a now tighter budget. I'd rather go to a $100 reimbursed meal at a great restaurant than to do another ff shop even if it has a $25 bonus. I won't turn either down.
I have stopped doing the green grocery store due to the same three questions needing to be asked. You can only go to the same store and keep asking the same employee the same questions so many times. I turned down the location I could almost walk to even after being offered a large bonus because I do go there more than once a week and have been going there for 30+ years and do not want to be labeled the mystery shopper with the employees that know me as an easy regular customer. To even ask them where something is located in that store requires me to walk the whole store to find that one newer employee that does not know my long term status. The other ones would laugh because I am usually the first one to notice and ask if they bumped something I buy and ask if it can be re slotted or special ordered from that rep. (With success most times)