1. Do you know what sub-affiliating means? I can point you several affiliates, which have sub-affiliating programs. Some of them (in online poker world) are for example: http://www.rakereduction.com, http://www.raketherake.com and http://www.rakebacklovers.com.
2. I use google analytics, so I see how many unique visitors I get daily and in total.
3. From the feedback I have gotten from my players and based on from what sites my players are coming to my site, about 90% of my players have never gambled in an online casino. Many of them have tried online poker thou in the past.