>>The two later cashed in chips they bought for $1 for $25, netting a $2,000 profit...

So let's see, (I ain't Math Boy, so could be waaay wrong!) if you bought a chip for $1 and sold it for $25, your net is $24 profit. $2000/$24 = 83.33. Harrah's math, since they pay 6 to 5 on blackjacks there. Guess they must be pretty clever at Harrah's to miss all those purple chips walking off, what, over four stacks?