I am helping a friend make a "facebook game" and within 1 week in alpha status with ONE post to friends we already have 10,000 players. He is studying Zenga's money making setups and asking how we can replicate them. I suggested lower prices to entice the dollars out of the wallet faster.
Honestly, if you can find some half-assed coders and a http server with mysql and php on it and have a game idea that is somewhat fun you can get a million players easily. I suck at PHP,HTML5, JS and it's working. IF he actually hired some skilled people and some skilled artists, he would be doing far better.
The number of facebook games out there that are crap are amazing and they have players..