Does it pay well in Club Troll?
Maybe the newbie can do basic math? Difficulty is growing at >1% per day (short term even 3%).
1%^7 = 7.2% per week.
1%^30 = ~35% per month
Your shares represent 15 GH/s each. To just keep up with difficulty, that would need to increase by >35% per month or ~5GH over the next month.
Lets use tsm13's optimistic estimate for mining revenue: 0.002393 BTC/share/week and lets even assume difficulty wouldnt go up this month. 50% reinvestment yields ~0.0005 BTC or a bit over $3.
$3/5GH =$0.6/GH. Good luck with that.