Limitations in inventory (limited by sales force reach, geography and the number of their business clients) will make effective filtering very difficult. If yo

Limitations in inventory (limited by sales force reach, geography and the number of their business clients) will make effective filtering very difficult. If you think of deals as SKUs, there's a huge granularity mismatch between filtering 50 deals in my geographical area vs. filtering millions of products at Amazon. (Not to mention that it would seem to be very difficult for them to capture much useful data about user preferences to make recommendations or perform proactive filtering.)