One of my project started out as something that I built for myself. When I got popular though, I had no time left to use it for its original purpose as I had to put all of my time into development and customer service. Unfortunately I ended up becoming very detached from the market for which I was developing.

My other current projects are e-commerce related, for other people. I don't shop at their stores in particular, but I feel like shopping elsewhere on the web gives me similar insight.