Bitfloor gives you .1% USD rebate if your order gets filled. Someone is getting .02 sized buy orders filled, sending the btc to satoshidice then getting the winnings returned to them and putting up sell orders at a higher price.
1.957 x 0.02 payout +0.001 x Buy Price + 0.001 x Sell Price + Spread
Good idea, lol. How did you know the address was bitfloor though?