Hm, I am equidistant from 3 different grocers and sometimes 15 dollar steaks are marked down to 10. I think you're right with a variered enough basket the sales will be a wash but maybe if I let the algorithm decide what my diet is that week based on what's discounted the most I could save some dollars. The thing that actually keeps me loyal to one store is I'm familiar with the floor plan so it doesn't take 5 minutes to find the hot sauce, so I would love a wayfinder for unfamiliar stores. Could be a good app for ambient competing / meta raybans.