Giving up your plot should be easy and not be too restrictive

[Jojoya]

It wouldn't be a gil sink if you could get your gil back...

Yet SE gives players some of the gil back when a house is demo'd, or when the player transfers to a New world, or from a Congested world to a Preferred world, or discounts the purchase price when relocating...

Decorating ends up a far more effective gil sink. So many items that tend to be used as base decorating components like the partitions but can only be purchased from vendors. A lot of times we have to vendor the ones we were using but no longer need to make room for new items just to have to rebuy them later when we redecorate yet again.

I would hope that improving player access to content is more of a concern to SE than gil sinks. If they're really worried about gil sinks, they should remove some of the ways players have to avoid them (like the Aetheryte tickets) or increase prices on higher level items.