Good you have found your niche, and it's great that you haven't overextended yourself when it comes to delivering value to customers. I would say though that your work is a subset of web dev, and while totally valid in that area, I don't think it applies as concretely to other domains, particularly those with larger audiences, or those with needs for greater reactivity.
Are you disagreeing with my assertion that the above poster's view is a bit too narrow in its application? I know a lot of sites run rails/php/django, but that does not mean that they are the majority, or even part of a minority that are the 'most' succesful.
