I personally don't really have a use for the service. A document scanner allows me to use whatever paper I want and scan whatever I want.
It is an interesting idea though if there is a market for this type of service.
I was trying to think of a way to embed a scanner into the front cover of a notebook (with replaceable pages) but it just didn't seem practical, a flatbed or feed scanner works about as good as you're going to get.
Plus, these days you can just take a picture with your phone and be done with it. I do that for whiteboards for content I want to save before erasing them.