I had a brief look at coin chat, but I'm a little confused by the premise. Is the idea that people tip you for posting valuable comments, or what?
Sorry for the noob question...
People can tip you, but once you're whitelisted an random algorithm looks at the quality of your post and give you a random reward, ranging from 0.01mBTC to 1mBTC (unless you're promoted)
I recommend using CoinChat, you can get there by the link in my signature. Once you're whitelisted, you can easily get 0.001BTC, it's even quite easy to get 0.01 after a while.