Subscription Services are on the Rise
Subscription based businesses are taking over one website at a time- Birchbox, Plated, NatureBox etc.
If you ask me subscription business is the ideal business. You have to sell your customer once and maintain the relationship. No need to sell them again.
Check out these websites for more subscription businesses:
@Mashable link: http://mashable.com/2013/07/15/shopping-delivery/