It can if it's done right. I would love to open a small film (primarily) photography store here near Milton, De. Of course I lack the fundage, but I would love to do something like this given the opportunity. Come on lucky powerball. (I wish the numbers on my fortune cookie would be more accurate.)
I think mgb74's estimation of a 50 % margin is really optimistic.
Years ago I worked for a company that on paper shouldn't have survived but it did with a net of between 6 & 7% Was written up in ptn for being able to survive at that point.