The whole local coupon / flash sales aspect seems really easy to launch - not too much technical complexity involved etc. Flash sale sites with real inventory

The whole local coupon / flash sales aspect seems really easy to launch - not too much technical complexity involved etc. Flash sale sites with real inventory are hugely complicated. E-commerce and warehouse/logistics are already a giant pain in the ass, now combine those two with millions of people all submitting orders between 12pm and 12:01pm.