I just looked at some stats…
The now defunct Kiwi Bingo aff program (they change aff programs more often than I change my socks BTW…is there another under way yet?)
693 clicks from one bingo page and never a depositor. Now I am depressed but for the fact prof mentioned POKER! 
I view those clicks as “double opt in” clicks… searches from engines…to my bingo page…to the bingo room. Gold plate traffic as far as I am concerned.