honestly the issue of lower price for POB is a big headache for the holders of POB generally. In one of my comment in #pobtalk I ask if it possible for POB to be twice of hive but now it seams as if it is impossible with this everyday downward value.
Here you can see that 4718 POB was bought for 8606 HIVE on June 13th, then 6015 POB was bought for 6103 HIVE on June 25th. Today that figure is 3089 POB for 2580 HIVE.
With this the price of POB is getting worse day by day. but I hope it will come up very soon just like how it was in June 13.