I got an idea for the future, instead of tier scaling with the age of the mod, you could scale it with the amount of days (game days) it has been on a server or how many days the server has progressed. And/Or how many purchases from the black market has been made.

I agree with the above. If you're scaling items by real time mod updates, then the items could be out of reach for servers that are new and underdeveloped when the mod is very progressed. Similarly if a well established server installs it early on.

Scaling with either how many purchases have been made or with game days would be easier. The structure could have a timer (INI configurable would be a plus) that causes it to decay at a specified rate (like it could use a dino's age timer). When it decays, it simply respawns somewhere after an alotted amount of time.

Also making the structure able to be destroyed is good, if that's not already able to be done. In the off chance it appears at a bad place or maybe a tribe wishes for nobody else to get its items. It would still respawn after its normal cooldown. Perhaps immune to wild dinos, to avoid it being destroyed before a player could access it.

i'd love to see an option to allow admins to set the items/dinos available for sale via the ini, that way you dont need to change whats for sale