Hi,
I have a 22 years of experience in the software development / concept selling and implementation areas.
In 2000 I have developed a project for a USA based company having a chain of hotels, for tracking down eating habits of the customer and integrating the entire data on a central server. The company could then can find the various interesting facts about their restaurants such as most popular dish, frequently visiting customers, their eating habits etc. In turns company can send their customer their most favoutite dish on Birthdays, Marriage Anniversary etc.
I am confident that may interesting reports can be generate using the buyers data and same can be used to create interesting schemes such as discounts coupons, surprise gifts. The solution can also be used as a CRM package.
Please let me know if you like the idea.