Insights on the ROI of business blogging after 9 years and 1.2 million words:
Lee Odden (Inactive Account)'s profile photoTim Capper's profile photo
Oh +Lee Odden we wanted a Juicy Net Profit Number, but you skillfully dodged past it.. :)

But well done for 9 years !
+Tim Capper Sharing financials for my private company runs contrary to all common sense for me. BUT - it's still a good question and one I'll try to answer more specifically with a proper blog case study (vs. a blog post). 
No Worries +Lee Odden 

Would be handy to see What the ROI of company Blogging is - as per the headline, but understandable you don't want to be giving out company financials. Perhaps you could quantify it in another way.