I had the same question in mind, but I searched to see if anyone had already made a topic on it first.
I am farming PD's for AddSlots myself, since I have terrible luck with the shop not giving 4 slot early armors, and I don't think the veterans want 1-5 PD junk for precious PD's, so I didn't bother with the selling stuff.
I'm new to the server, and I also came from a different server from long ago, I saw someone streaming PSOBB and I joined here.