Below is an inforgraphic that answers a BIG question. Does pinterest have a payoff? Indeed it does! It does not answer for which industry specifically, although in the US the top categories on Pinterest are Crafts, Interior Design and Fashion. The most interesting fact gleamed from this graph is that of the 12% making purchases online and offline after pinning, 46% are from the Pre-Jan2011 boom and are more active on average.
The new question is: Is "warming-up" period for Pinterest users before they get comfortable with making purchases, or is the post boom demographic in a different category all together (e.g. younger with less income)?