Lets see, 30 days has 43200 minutes.
1 block (50 btc) every 4 minutes = 540000 btc.
540000 * 0.06ct = $32400
Man, that's a nice extra each month
You neglect the fact that the difficulty is adjusted every 2016 blocks. You cant really average more than 1 block per 10 min over a long run.
Also you cannot stop other people from getting some blocks no matter how fast or big you are, if they are running they have a chance of finding "winning" hashes. Your participation does not effect that except indirectly when the difficulty changes for everyone.