I think there's a very wide spectrum of people who can appreciate AppJet. I would argue that most programmers don't have the knowledge to deploy a web app, especially if you define a "programmer" as someone who can hack together an AppJet app, which is very easy to do. Even for a very capable programmer, it's a lot of work to get an app hosted if you haven't done it before. Then there's programmers who CAN get a web app online, and have, but don't want to manage all the machines and software involved for every little project.

Before sites like Flickr, for example, it was possible to post photos online, just harder. Maybe the difference in perception is that hackers aren't expected to want such an "easy way out" when it comes to programming, their very area of expertise. But as a hacker myself I can tell you that using AppJet to whip up a quick app is a pleasure compared to going through all the typical production work.