I advertise allot a different bingo sites on most platforms. I have had
the best performance from Leapfrog gaming sites, specifically with
Bingoreward.com. They offer free money no deposit required, so the
players take a little longer to deposit, but I find the players come
back after 2 weeks or so and stay along time.
My earnings have shot up significantly over the past few month due to
there new Video Slots. So far so good 
Plus I like the competitions they run for webmasters!