Yes, don't know if this would be a success story but sure would like to try. I've also some colleagues who definitely wouldn't want that at all.
Again yes of course for me and no for some colleagues..
Depends a bit on the target audience and the kind of software you're writing. Functionality comes first until it reaches a minimum level. I would say at least 7 and in that case the design would be more subtle. Someone told me something i believe.. You can't have "no design". There's only good and bad. If you don't do anything with it, it's probably bad..