Not to beat a dead horse too badly, but if anyone was interested, ranlo's deceptively "same odds" dice variation is actually anything but. For a set of 10 rolls, the odds of the same number occurring in the set are as follows:

zero times: 16.15%, once: 32.3%, twice: 29.07%, three times: 15.5%, four times: 5.43%, five times: 1.30%, six times: 0.22% seven times: 0.025%, eight times: 0.00186%, nine times: 0.000083% and ten times: 0.0000017%.

The actual average payout for the guy who gets $1 for every four is $1.67 per ten-roll game. Guy two, who needs to roll four fours for $4 (I don't think I've ever used the "for" sound in my head that many times before), contrary to being 20% worse off as ranlo suggested, is actually averaging $0.23 per game: about 86% worse off. How fortunate that mining doesn't work like that at all.