The ads are fairly nonintrusive, so I don't see this as big deal. You have to pay the bills somehow...
I doubt that the ads would result in any significant profit but, out of curiosity, what's the status of this site with respect to profit? Once the moderators are paid a fee for their services and there is money left over (fat chance, I suspect...

), are there any plans to spend any remaining funds on a worthwhile djembe cause?
Cheers,
Michi.