I agree with Dom, I know that if a visitor find my site, my conversion rate is very high. My site is a newbie (only 3 months old), but every visitor I got views at least 8 pages, and 8 from 10 visitor clicks through to some poker site.
I dont think this conversion would be the same if I redirect the visitor directly to the poker room. I like to “warm up” my players, and maybe they will sign up through me, but not without my recommendations 
And yes, I don’t want the poker rooms know where and how (for what keywords, etc) they get the traffic.
Hope this helps 