The 300k is not a price that you pay to unlock a feature. With the 300k, you purchase a room located within the current FC and since you have obtained a permit to use room within the FC, you will gain access to a feature with which you decorate the room in question.

By leaving the FC, you’ve explicitly decided to “demolish” the room while returning your belongings which have not been permanently bound to the FC room. So, when switching FC’s you will be required to purchase a room within that FC to gain access to it as well as the feature with which you can decorate it.

It is the same when you decide that you want to move to a different plot al together, whether or not you’ve purchased the plot of land for personal or company use. If you’ve purchased a small plot for 5 Million and spend 450k (using my own server as an example) on a permit, you will have permission to place a house on the given plot. If you decide to move to a different plot, you will have to purchase both the new plot as well as the permit to place a house on that new plot you’ve purchased.

Purchasing a room in an FC or permit to build a house on a plot of land doesn’t mean that you “physically” own the room/house. You get permission to use it or build a house on it. So, you cannot take the entire room/house with you when you move to a different plot/FC. Only the stuff you put into that room/house will be returned to you when you choose leave the FC/plot.

This rule also applies when you want to switch “Private Rooms” within the same FC. If you want switch from “Private Room #13” to “Private Room #1”, you will have to “Demolish” your current room “Private Room #13” and purchase “Private Room #1” in order gain permission to use it.

In short, think carefully before purchasing a room within an FC or a plot of land. You are paying to gain access to that specific room within the FC or to place a house on that specific plot.