About the payout percentage thing… I have them on my site, but only for 10 or 15 casinos probably. I do them all myself– go to each casino site, find them, and then put them on the page (I also break them into categories…slots/table games/etc.) It’s not that bad, except that I like to update them every month. I’m still trying to figure out a good way to do it, so that vistors can see a running record of all the months and compare, instead of just one month. It’s nothing fancy at all but it works for now. 
This is my payouts page.
About the forums.. my opinion is that, there’s nothing worse than going to a site, seeing they have forums, then visiting them, only to see that no one’s posted in a year! Even though the site might be very active, it leaves a bad impression.
Good luck with everything!