What do you want your blog to do for you - direct traffic to your business?
-- YES!
I do offer Project Wonderful ad spots but that was just to offset the cost of advertising on Project Wonderful myself. It's not a real source of revenue nor is it intended to be.
I try to share some insight to the inspiration behind new product listings or a little of the process of making them.
This year, I will even try to sell things on my blog directly.
I don't spend much time on it. Maybe 10 hours a month. My goal is a minimum of 52 posts a year and not on a particular schedule. (I also post the treasuries for another team on their team blog. I spend about 4-5 hours a month at that.)
My blog:
http://www.fairycardmaker.com/