Ultimate Shoe warehouse making millions

Everyone needs a good pair of shoes. Some people have a whole collection of shoe. Shoe stores are generally limited by the store space. They can not have a warehouse collection on display at all the time. Zappos.com is web shoe store. It can have a big collection of shoes available on the web. Its can has a large number of warehouses to store the shoes. Local stores are not able to compete with it. It's making millions.

Problem: Everyone needs shoes. Shoe stores are limited by store space.
Idea/Solution: Website + Shoes + Large collection + Warehouses
Site: http://Zappos.com