In my personal experience, I have found that Pinterest is used a looooot by the DIY crowd, by those interested in crafts & cooking & weddings & fashion & art & the like. Looking around at statistics about Pinterest demographics (I can't verify their authenticity, but it sounds right to me) - while men account for 40% of Pinterest signups, they only account for 7% of total pins. Which means that the vast majority of consistent Pinterest users are women.
While we all know that women can & do enjoy the pr0nz, the vast majority of our target demographic are men. Not crafty women. Which means that Pinterest isn't a super awesome advertising platform for our work, or in hopes of achieving sales. Time would be better spent on platforms our target demographic use more often: i.e., twitter or instagram or snapchat.
I use Pinterest in my personal time because I love DIY and crafty things, but I reaaaaaaally don't think Pinterest is a good platform to market our work at all.