0.201 XPM / k PPS / Days +/- 5%
With difficulty 9.277 and HP8 optimization ,,,
Network currently estimated at ~65 000 000 PPS
... not going to run large scale experiment every time I want to know the profitability factor.
Do we have anything better ? And how does it scale with difficulty ?
Your estimate is really high. Few days ago 5 000 000 PPS would represent ~20% of the network, And I don't think that network has doubled since... So 35 000 000 to 40 000 000 PPS is a better close figure (~0.4 XPM / k PPS / Day).
Anyway the coin is still profitable, if you have large farm (at least 50kPPS) and can reduce variance.