saving the grove causes prices to good back up for Druid players... this is a an old bug from EA days caused by Larian making the actual grove a new map but forgetting to carry across the "i give discounts to fellow druids" code
[Linked Image from gog.com]
you would think saving them from rape by Goblins would at least earn a penny off

Luke Skywalker: I don't, I don't believe it.
Yoda: That is why you failed.