Just a guess, but you were probably trying to sell them their own data (total people in/out, peak busy times, largest/smallest crowd in location, etc.). That's not what business owners want to know the most. In my experience with retail-type stores, the owners and managers are more concerned with how their competitors are doing in comparison. If you were to sign up many related customers into a network and share quasi-anonymous data with store owners like, "a similar sporting goods store to yours located ~0.5 miles away just set a new weekly attendance record in the sporting goods category..." or, "a sports bar located within ~0.4 miles of your location is now at 80% capacity...", that is information owners will pay for. Rank the store against their competitors to show them what percentage of customers they are getting out of the total segment. The only difficulty is signing up enough related stores to provide meaningful data.