Really ? Did you choose to tell him to not attack the camp ? Maybe it's because of that, or it's a bug x)
I did some changes to the price and after searching for his wife the prices also drops. Still there is going to be alternative way of getting planks, but I'm not sure when I will implement it as there is a lot of other things I have to do right now.
Eventually I want pictures for all opponents and NPCs, but it's like few pictures per month I can get from Zoroj, so filling everything will take some time.