It would be best if you understood a reward system before accusing a pool of scamming. This is not unexpected behaviour for this pool when they have longer than average rounds (more shares per round).
To be honest the reward method itself is almost a scam at this point. The payment scheme used is 100% guaranteed to eventually build up a backlog big enough to put the pool out of business, and this was pointed out to Luke Jr ages ago but he didn't care. What probably pushes it over the line into "actual scamming" is that on at least a couple of occasions the pool built up a substantial surplus, and rather than taking the chance to switch to a payment scheme that wasn't guaranteed to screw over his miners Luke Jr pocketed the surplus and carried on going, speeding up the rate at which the pool failed and in effect adding a hidden fee to his "zero fee" pool.If it weren't for the halving during an unlucky dip, the SMPPS would have stayed viable for the long run.
