Maybe you wouldn't worry if you were buying the product to develop it and were not planning on throwing it in the closet to wither. I think Dennis was under the impression that they would continue developing the project, not just paying for his talent.

The foursquare guys really do believe in the idea. If I had what I thought to be a great idea, and someone canned it and told me to do some other work, I would quit and start over too.