50 gold is actually a bit low in my experience. I have used the rule of thumb (1 + prestige)*25 when buying items so a prestige 3 item I would pay 100 for. This may be high though. The game system encourages this as if you don't have adventurers dragging around huge bags of gold they will never be able to improve items with sages as this can cost as much as 75 gold, and it is in the realms interest to have well equipped adventurers.
I am mostly buying items to support the work adventurers do in the realm as stated before. Somehow my first experience with selling items might have set the standard when I rfecieved 100 gold each for two minor items.
