I spent about three years working on a webapp for simplifying the RFQ process, specifically for defense projects. Ultimately I decided to finally call it quits on the app when I realized that even if I built this thing, I'd never have the skills/time/patience to sell it. Wish I had realized that sooner!

After work I would typically spend a few hours a night hacking away at whatever feature I thought was a "must have". Suddenly the list of features that were absolutely needed to ship a 1.0 release grew quite long, and was too much to manage on my own.

I called it quits a few years ago at this point, but I wouldn't say I regret my decision to have put so much effort into a project. It gave me an opportunity to contribute to some high-profile libraries like Lucene.NET and Backbone, and I most certainly grew as a developer.

I wouldn't beat yourself up too hard, though. I'm sure you learned a whole lot about browser limitations, animation, and how to manage your time and expectations in the future. If you agree, then I'd say it wasn't a total loss at all.