DXL - 2:14 pm on Apr 2, 2013 (gmt 0)
As a professional, would you find it interesting to be offered a relatively modest sum for the initial creation of the store and then a fair part of the company profit for as long as you stick around to help out?
This is an offer that people occasionally make to web developers, and it's an offer that is overwhelmingly refused. To the point that it's probably on a web designer's top list of potential clients that annoy them.
That and someone asking for a website "like eBay but better" and so on, but saying that all they have is a $900 budget.