Question about room and leaving FC

[Jeykama]

You get your non-unique furniture at the Calamity Salvager NPC if the FC leader decides to kick you from the FC. If you leave an FC manually, you have to pick up your furniture and destroy the room yourself before doing so. Unless it's a one-time item like crafting stations or primal/coil furniture, you can store them away to use in your next room.

Either way, you never get your 300k back.