No brainer IMO: affiliate programs. One decent player could be worth months of adsense. Adsense might give you a regular building income, but long term if your traffic is clicking on adsense ads, some at least must be interested in casinos, so grab ’em yourself.
And just think, for $0.20 you could let a $100k whale slip through your hands!
If not, and you have decent traffic, then shout – I’ll buy a ad 