Whoa.
Fun fact: if you guys get 2,000 MH/s (extremely likely), you'll be making 365 LTC per DAY in fees! And that's at the current diff!
hashrate = 20000000000
ltcdiff = 1102.31
hrstoblock = (ltcdiff * 2^32) / hashrate / 60 / 60
(50 / hrstoblock) * 24 * 0.02 = 364.987 LTC
I gotta open a pool...
Update: 3MH/s, 547.5 LTC/day. They could do this giveaway every month!
I think there is a bug in your calculations.
2GH is estimated to make 2142.34LTC per day for the miners at the current difficulty (which is even lower than when you calculated - 939).
2% of 2142.34LTC is 42.84LTC not 364.
Also, your not including orphans which the pool absorbs, luck, payment fees for withdraws (which are free for the miners but the pool pays 0.02ltc on about 50% of them) and server and infrastructure cost. There is a reason no medium to large sized pools run 2% PPS and all charge 3,4,5,6% PPS rates, and it's because at 2% you are just about breaking even. Orphan rate alone can be as high as 2% which would wipe out all pool income and that is before fees, luck, and infrastructure costs.
I do this because I love it and believe in LTC, not to get rich. If it wasn't for tenshou the pool would not be able to do this contest.