I don't think I've seen any that low in my area. Most are scanning shops that never get picked up. From my experience, most of the shops I've seen on the secret platform are flat payment. The few dining shops I've done, I've made sure to research the menu before self-assigning to maximize the return after reimbursement. Sometimes there will be a specific day or happy hour specials. For example, there was one shop with a $100 flat payment, but I paid $40 for the meal, and pocketed the rest.