My hash-rate shown there is about half of what I'm actually hashing (6000kh/s instead of 9600kh/s).
Your hashrate is estimated from the rate of (accepted) shares. If the coin that currently being mined has a short block time, you'll have more stale shares and the site will report a lower hashrate.
Also the payout I have in the last 8 hours is equivalent to 3.11 LTC (I took unconfirmed balances into account), while I should be getting 12LTC/day at my speeds. So there's 3 LTC short, even though this pool mines at equal to or greater than LTC profitability.
If you earn 12 LTC every 24 hours, you earn 4 LTC every 8 hours, so there's only a difference of 0.89 LTC. That could be due to a lot of things. Bad pool luck or miner misconfiguration come to mind.
Ohhh this pool is so fishy.
Yes they're skimming my shares, that's for sure. Must be that "time based PPLNS".
If there seems to be something wrong, provide details (On which port have you been mining? Which miner are you using?), ask questions and give it a little more than 8 hours. Jumping to conclusions and making accusations doesn't help anyone.