Devs stated that
1) linked teleporters will work and
2) chars capable of marking house runes at the house can do so (you can't mark runes in the abyss at the moment, but I guess nothing's stopping you from recalling in if you have a rune).
Will make a great vendor house. Esp if you link your existing vendor house to it. Guaranteed traffic.
You can also keep it private, then link it to your shop. Folks using the the teleporter from your shop can get to the abyss, but will be booted from your abyss house, so you still have privacy.
Or you can be evil and keep it private so that only you can mark runes. Then mark runes and sell em for 10k each.
Finally, you can be an evil *******, sell the runes for a while, then public it and link it to your shop. But you won't be very well liked.