If you want to involve luck into mining sign in ozco.in and mine on POT. Yesterday my 400MH/s Lancelot found nice 2M share and paid 0.0028 BTC instead of 0.00000009 normal share...
Good luck.
I don't get it, the difficulty is 500million what do 2M share do?
POT is a payment type that rewards for solving higher difficulty shares. If you beat the current difficulty you get 25BTC + fees. Say you solve a 10 million dif share, the pool kind of pats you on the back by paying you more for that share (even though they get nothing for it). Of course they have to skimp somewhere so regular shares a worth a lot less. Kind of like PPS on a curve.
I believe only Ozcoin had it (recently removed).