He seems like a great guy. My wife, Lisa, is heavily involved in Town Lake Animal Shelter, and we've always appreciated his support of the group as well as all of the volunteers throughout Austin.
I think they're whole advertising model is confusing. I've had a couple of ads on there over the past month, and one day an ad will receive 25,000 views, followed by 300 the next day. There's no indication as to why this happens, but I saw that once I bumped up the amount I was willing to pay for clicks, I suddenly got more views :)