I have ready conflicting theories about the trolls. One theory says there is only one troll at a time in Jot' which is why they are hard to find, another says there are a lot but the lag is so much when you see a troll it has already been killed.
Like to say there is no reason at all why Jot' can not have as many trolls etc as a home kingdom. They would skill need a lot of energy points for a small reduction in their health.
I find it hard to believe that Plarium would be against having more than a few Jarls get the loot drop from the attacks but that is what is seams like.