Anyone who is considering putting up a vendor house in Fel Magincia may want to spend a little bit of time wandering around on Siege to see how people run their shops there. There are many player-run shops and public houses on Siege, far more than I ever expected to see.
A few places to run around and check the shops on Siege are:
All around Zento
All around the Yew moongate
South of Umbra
You'll notice I didn't list Luna. Yes, there are a few shops in Luna, but is is not the "shop owner's paradise" that it is on other shards.
Stick around on Siege long enough to also listen to some of the general chat and see how sales are arranged for items not already in stock on someone's vendor. If you really want to travel around on Siege a bit, the moongate north of the west Brit bank is now a normal out-going moongate. If you go to Umbra, south of town about two screens below the lower bridge is a big open plot that serves as a "hub" with teleporter pads linked to other pads in many houses around Siege.
And, of course, if you take the time to visit Siege and decide to stay a while, give a shout out in chat and let folks know. You will find the majority of folks there are very welcoming to newcomers, in a good way of course.