i think a lot of rig rentals gets pointed there, as the pool hash rate varies wildly from 2 - nearly 6 ph, combined with people piling on hashing power when the pool's on top of itself, and then moving it when the payments aren't going out on time, only to move it back then when it gets cleared.
I'm waiting to get paid too, but still waiting and seeing what happens. I've been mining on the pool through good and bad since October, and my review was updated a while ago to change the regularity of earnings from 5 to 1, and a note mentioning the issues. but right now its down under 1.4phs with less than 1000 workers. So two effects there, less hashes to go towards finding blocks, but also will slow down the liability growing as fast as it has been.
this is the downside of a PPS pool.. specially one with NO FEE..
if someone puts in a ton of hash for a short time, but no blocks are found during that time, the pool loses funds that it can
never recover.. it did say in the faq tho (not sure if its still there) that if someone put hash from rentals in the pool their account will be closed and the funds forfeited.. but i guess they arent doing that.
if someone puts in a ton of hash for a short time, but no blocks are found during that time, the pool loses funds that it can never recover.. This does not make sense to me.... as even with a large amount of hash as you state for a "short time" the pool will not be on the hook for a lot of coin and if the pool gets a lucky streak the pool could recover. What makes it hard to recover is the hacks of the pools wallet, the paying of the 10% bonus(now 1%), charging no fee and a prolong bad luck streak. Now I can understand the OP using the pool as a loss leader for another business purpose and this is what was always said what the purpose of the pool was, but no other business has come along, so as stand alone pool can not profitable and the late/missing payments show it.
As far as the rentals I think is the past rentals were finding a way to take advantage of the pool and they were stopped, but I believe they were allowed again later once something was changed.
EDIT: Our combined oustanding balance in queue to be paid is
191.80840895 Bitcoin.
also the pool is paying for a lot of servers...
Use one of the following servers if the geo server doesn't work for you or as a backup.
stratum+tcp://west2.bitcoindigger.com:3333 (Northern California)
stratum+tcp://sanfrancisco.bitcoindigger.com:3333 (San Francisco)
stratum+tcp://losangeles.bitcoindigger.com:3333 (Los Angeles, CA)
stratum+tcp://fremont.bitcoindigger.com:3333 (Fremont, CA)
stratum+tcp://east1.bitcoindigger.com:3333 (Virginia)
stratum+tcp://east2.bitcoindigger.com:3333 (New York, NY)
stratum+tcp://newjersey.bitcoindigger.com:3333 (New Jersey, NJ)
stratum+tcp://miami.bitcoindigger.com:3333 (Miami, Florida)
stratum+tcp://ireland.bitcoindigger.com:3333 (Ireland)
stratum+tcp://london.bitcoindigger.com:3333 (UK)
stratum+tcp://paris.bitcoindigger.com:3333 (Paris, France)
stratum+tcp://frankfurt.bitcoindigger.com:3333 (Frankfurt, Germany
stratum+tcp://amsterdam.bitcoindigger.com:3333 (Netherlands)
stratum+tcp://amsterdam2.bitcoindigger.com:3333 (Netherlands)
stratum+tcp://amsterdam3.bitcoindigger.com:3333 (Netherlands)
stratum+tcp://tokyo.bitcoindigger.com:3333 (Tokyo, JP)
stratum+tcp://sydney.bitcoindigger.com:3333 (Sydney, AU)
stratum+tcp://singapore.bitcoindigger.com:3333 (Singapore)
stratum+tcp://saopaulo.bitcoindigger.com:3333 (Sao Paulo, Brazil)