That's true, but xbtec's escrow was only for 1 week. So I see what you mean about multiplying by 4. I think you're right, it should probably be enough.
About the rates, it looks like only the full member rate is higher than PD, looks like senior and hero members, the rate is equivalent,right?
PrimeDice pays:0.0012
BTC for Hero.
0.0010
BTC for Sr.
0.0006
BTC for Full.
0.0004
BTC for Member.
DiceBitco.in pays:0.0014
BTC for Hero.
0.0012
BTC for Sr.
0.0007
BTC for Full.
0.0004
BTC for Member.
So DiceBitco.in pays more then PrimeDice if you look at Hero/Sr and Full member rates.