I inadvertently built a mercenary camp in an Outpost ZoC I control. I did not realize that this resource gives me a horrendously feeble unit costing 4.5 gildar wages per turn. I would be more than happy to destroy this camp I control, or unbuild it, but I see no means of doing so, short of destroying my outpost (which I otherwise need). That could be addressed in a patch.
Additionally, it might be worthwhile considering making mercenary camps slightly less awful.