That's great, but I think this is even more accomplished than a majority of developers. The majority of developers have a wild or fun sounding idea and pursue it for a few days (guilty of this myself). Most likely, the "fun" part only constitutes a minority of overall functionality, and I find it's generally the non-fun stuff that demotivates people to not finish (e.g., billing, setting up a web site, user management, etc.) The key has to be to either determine if those things are critical, or somehow fit them in before you're left with nothing other than a pile of non-fun stuff.