It makes sense when it comes to building web apps. I don't think it works when you are building an iOS app. Is there a site which sells iOS app themes?
I'm not sure I agree with that. Instapaper is very successful in spite of having a fairly basic design (I seem to recall Marco saying he had never used a designer). On that small of a form factor, I think usefulness trumps flashy any day.
If you're doing a game, or something graphics-rich, that would be a different story.
If you're doing a game, or something graphics-rich, that would be a different story.