If I understand correctly, you are suggesting some kind of goal? Like obtaining something just for that person, something valuable and unique, ...?
Sure, it would encourage some players a lot, but then we have the other side. For example, if someone obtains part of Marind Bell or GG : - what about king/queen of that land and his/hers authority over that part of land? ( sorry If this is already clear, haven´t read about it). And about regular players? Should they pay some fee for entering it?
I am not sure, if normal land can/should be sold. Maybe if we talk about some new area, which is somehow connected to the owner (like, he drawn it, it was his/hers idea,...)
Ehm, it looks like I am not sure about many things. Indeed, that´s right. But I agree with you in creating encouragements for players for doing their job good,..
What about minor spells/abilities somehow connected to their jobs? For example, woodcutters would be able to add +1 resource regeneration for specific area. And that ability can be with some countdown, lets say one or two days. Or maybe experienced woodcutters can choose one adept in profession and this adept may have additional +0,01 points for every lumber/branch,... he cuts.
Also, you mentioned thing about "make someone work". Well, if it´s not slavery xD But we already have our monarchs, Queens and Kings. It would be interesting, if they put up some bounty/reward for your extra work for that particular land.