Have you tracked their payout addresses? I think 1Payday1sm5wGqtatKscfXnxARZ2B2MF3z is one of them. I'd like to know how many contracts they are actually paying out on. 38,000 transactions would be half of all transactions on Sunday, so I have a hard time believing that stat.
No, havent looked in to that yet. But if you look at their stats page, they have ~6700 customers, not 38K. And you can pay thousands of those in one transaction.
If your listed payout address is correct, then they are paying ~225 BTC /week through that. Theoretical payout for 4.4PH is >380. Perhaps they use other addresses, perhaps customers have been reinvesting their divs..?
Yup that 1Payday address is PB mining's payout address as reported by their customers consistently.
Mar 2014: https://bitcointalksearch.org/topic/m.5617470
May 2014: https://bitcointalksearch.org/topic/m.6674107
Aug 2014: https://bitcointalksearch.org/topic/m.8607692