After speaking to someone, for a little while, and genuinely being able to hammer out ideas instead of just being told "why would you even say that bla bla bla" i came up with an idea, i am unsure if it is already here, but my solution is simple, and i doubt its even that hard to implement,
A player based, "build zone lock" that can only be put over a certain area, can be placed next to each other, and are all tied to the original placer of this block, the simplicity of this cannot be overstated,
you would essentially select an area, block it from being altered, say if you want your build to never be altered but your builds 1 x 1 , make the box 2 x 2, and your item in the middle, so you have ample room to keep other items away from yours!
REASONS THIS WOULD ULTIMATELY ELIMINATE RESELLING - It would be- unremovable, it would be, a box that does not allow modifications to the original item, and thus, if people wish to change the item, they would need to have the tab (this is probably the most complicated part) of what blocked schematic they have out, PLUS what USERS base it is on, (in a small gui) and be able to delete or just bring the barrier back to their base for re use...
Barriers would be namable, so you know HOW MANY OF THEM are on each build, and perhaps even it could be taken down- to a "schematic by schematic" type of thing, where you simply cannot edit schematics (this of course leaves room for- adding onto an area around) but for now, this is the idea, put any changes you'd like to see below, Thanks for reading.