Someone calculated at the current rate 3gh/s will make about 700 coins by the end of the year then it will get so hard you will only be getting fractions of coins every few days.  But someone else posed a good point:  the rapid inflation will stop and the difficulty will fluctuate and eventually settle at near the same rate.  However if 3gh/s is 700 coins my about 1.5 gh/s assuming i start in the next month will only make about 200 coins.  The problem is if miners realize that they are not making enough money to keep repairing their systems the difficultly would go down but then just to make them start mining again and it will go back up.  Finally when the miner stop mining some of them will decide to sell off their bit coins and crash the market.  With not much to purchase with bit coins yet, this is wear I ponder if the long run will be worth it.  I know no one can predict the future on what will happen with bit coins, but my prediction is pooled mining will take over and i want NO part of that.  So please help me decide if I should jump in or if I am to late to the game.  Also I know I have posted about this before in replying to other post, but I just want to get some more thoughts on it.  Thank you for all of your help!