Depends on the site. A site like sportsbook gets a lot of traffic from the actual sports bettors on the site already. Some sites get there traffic from TV ads. (Full Tilt and Poker Stars) big sites have fish, small sites have fish. Table selection is key. Good multitablers find fish, no matter what site they are on. Find the right tables and make sure your BR is safe no matter where you put it, avoid the obscure.