One fun thing I learned here is that advertisers won’t even consider a site or game that’s not launched yet…not even Google AdSense would approve me. I am tracking this though and obviously want to make number go up.
One metric I track is what % of users return the next day. I'm trying to bring it up to 10-20% before I assume there will be any revenue. Currently at 5% for my game, which may be due to difficulty.