I think it really depends on the store, and as others have inferred, if it's a place in which you find value aside from mystery shopping.
As far as I know, this particular store is the only grocery store TS has in my area (aside from that competitor audit), I've actually only seen one other grocery store besides this in my city, period, from another MSC (Sinclair), and I wouldn't touch it with a ten foot pole. Smaller reimbursement, transportation cost and the time it would take to get there isn't worth it for me.