Love this! When I first joined my company, my boss was surprised that I wanted to beef up our Pinterest page - I think most people consider it a good place for B2C marketing, or for marketing a physical product of some sort - but many are hesitant to use it for a B2B SaaS company.
I recently found an infographic (and subsequently blogged about it: http://www.meltwater.com/social-media-blog/did-you-know-social-media-stats-for-2013/) that would probably be an arguement against using Pinterest for B2B marketing because it says that the most repinned pin is garlic cheesy bread, food is the top category, and Nordstrom is the most popular brand.
However, your stats show that Pinterest can drive qualified traffic that leads to conversions and sales - and I'd like to believe that includes B2B brands, too. Let me know if you can find any data that specifically addresses B2B - that would be awesome to have. Pinterest is not one of our top social channels (Facebook, LinkedIn and Twitter are), but it's a fantastic place to showcase our more visual content, like E-Books, Infographics, charts, etc - and that certainly does get repins, clicks, and conversions.