[notahacker]

This. Basically all the emphasis is on the shorturl, which is a nice feature but the least important factor when selling products on an online store (hyperlinks are older than ecommerce, after all). There's nothing about what the buying process is like for the customer, how you support fulfilment, how easy it is to tweak prices/availability etc. - it's all assumed away by the "how it works" section which seems to imply you don't do anything after initial setup.