I think as a reader I felt it drew away from the PBRev logo too much. I prefer to think of the PBRev logo as the header, and the banner as the footer.
Also as an fyi, the banners are NOT a revenue stream. They're a way of making nee users more aware of the vendors available to them. I've chosen to go the "barter" route with the banners, so the vendors can trade banner space, raffle prizes, etc. In the case of Comet Pinball, you'll notice if you click their site you'll see a banner for PBRev.
I have more banners to put in the rotation, I still have to design them.