Cost to assign land determined by the value of the land

May i propose to have scaling costs to assign land?
Right now it costs the same amount of energy to assign 1 dirt plot as it does to assign a more expensive plot.

having it lower for the lower tiers would make (especially ftp) people more inclined to change them strategically when they need. (example; i need to use all of the energy i get for other stuff and the cost to reward for changing my uncommon plot is not worth it so they remain as they are until i have energy in abundance) although i would definitely like to be changing them more often strategically, but i just can't afford the cost of energy for that as it's much more needed elsewhere