Here is my personal opinion. The Private Stores mechanic simply does not work, for a number of reasons, not the list is that you only get to see what is for sale if you happen to walk by the seller and are enticed to look. The broker is the correct mechanism for doing this job, but the number of slots for items you can have for sale at once needs to be at least 30, not 10.
As far as the mod they added with 1.5.0.7, no, that is just not gonna fix the problem. Add an AFK tag that will disco you after 30 min, if you like, but get rid of Private Stores.
Not to even get started on the use the Griefers have put this to, blocking important NPCs so they cannot be targeted.
Do you have an opinion? Our front page, http://aion.zam.com/ has a poll up on this very topic.
Edited, Sep 25th 2009 7:51pm by Bludwyng