Over the years I've had luna vendor houses on a few different shards. Early on, I had thought how nice it would be to get weekly rent from vendors and strike it rich! Of course, if you put any thought into how much rent you charge, and how long it would take just to get the cost of the house back, you see the math doesnt really work in most cases.
In my case, i didnt care as much about renting as haveing free vendors. I rented spots out at a cheap rate, to fill the place up so that it became an important stop when shopping - of course the best spots in the house were mine.
A few months later i discovered why luna houses are so valueable. Its rarely spoken of, but the real gold in owning a luna house doesnt come from rent, it's found randomly in your moving crate. Every so often, a vendor falls for one reason or another. Several things on either end can cause it.
When vendors fall the renter has roughly a week to claim their goods. After a week, the stuff moves to the houses moveing crate, and is now owned by the homeowner. Theres a million reasons, from being dumb, to being gone, that a renter may not collect their goods. It happens alot actually, at least a few times a year with no fault on my part.
Alot of the time its junk, or a little gold... but sometimes.... Ive looked in my crate and found 280m in checks and tons of xfer and advance tokens all from one vendor. That may be rare, but it does happen.