I hope I am not out of place to recommend something.
Since the new patch I see a lot of people complaining about the upkeep (I don't since I play low level equipped character), so how about you give a certain bonus on kills (that will make the high level guys happy since they will make some extra money), about how much a kill is worth is up to you if you like the idea.
If you think this is unnecessary I apologize in advance and you can lock the thread!
Edit: Almost forgot, great work on the mod!