You aren't paying attention.

The unfair advantage lies in 10 or 15 FC people showing up to buy a plot. Not to legitimately share it. But to just give one of their friends "Tenant" rights, and let the friend own it and do whatever they want.

You act like the one who purchased the plot was actually going to use it. And that's not the case. They only did it to give it to their FC friend to use.