it seems no one is selling and buying, they just putting up sell orders .
Reported transactions:
2,000,000 @ 45 satoshi 2014-05-20 12:16:51 AM
10,000,000 @ 42 satoshi 2014-05-19 03:41:19 PM
1,000,000 @ 39 satoshi 2014-05-19 01:13:45 PM
10,000,000 @ 40 satoshi 2014-05-19 11:09:05 AM
22,000,000 @ 40 satoshi 2014-05-19 09:50:24 AM
2,000,000 @ 37 satoshi 2014-05-19 05:04:48 AM
2,000,000 @ 35 satoshi 2014-05-18 06:06:15 PM
40,000,000 @ 35 satoshi 2014-05-18 06:06:15 PM
1,000,000 @ 40 satoshi 2014-05-18 03:16:13 PM
1,000,000 @ 60 satoshi 2014-05-18 01:58:39 PM
We can expect much more transactions.