Vircurex is one shady exchange,to put it mildly
they change their rules every 2-3 months,raise withdrawal minimums,remove coins from trading,promise interest on deposits over 1 bitcoin etc.
do you know what is the withdrawal fee there? 200.000 satoshi,so almost everyone exchanged to DOGE (wd fee 5 doge at the time) to lose less
now DOGE withdrawal fee is 250 doge