At Freebitco.in we have managed to only reduce it for some. The bots and abusers prefer Doge for its low transaction fees.
I just checked. My reward is still down at 13 sat/roll. Why?
ID 11014042
As wetsuit explained above.
So we have been forced to reduce the free play rewards using an algorithm, specifics of which I cannot reveal as that would compromise it.
I can tell you that your gambling, buying lottery tickets and deposit history is taken into account.