On the btc-e most Sell and Buy Orders are with fraction numbers:
price BTC USD
922.1 0.01 9.221
926.002 0.111922 103.63999584
928.127 0.23490692 218.02345493
928.128 0.0227344 21.1004332
928.129 0.0227444 21.10973722
928.725 0.78773138 731.58582589
why is nearly none selling rounded up amounts like 0.01 or 0.5 but instead 0.111992?