We had a similar idea, but didn't follow through. Here are some non-obvious use cases that you may find interesting - Price comparison for the same item at dif

We had a similar idea, but didn't follow through. Here are some non-obvious use cases that you may find interesting - Price comparison for the same item at different local stores - Localized demand estimation for brands - Referrals for items not available in the traditional distribution model (eg. Organic/Handmade goods)