If we get to $6k or more, I'll try negotiating something additional for our adventuring party with Obsidian. Dunno yet what exactly it could be, but let's get there first.
Or we could grab an epic in-game item in addition to the party.
An NPC(troll) the player's party has to kill, capture, or escort in a race against the other adventuring parties. The trouble is this guy keeps regenerating or reappearing like some kind of skyrim dragon or oblivion gate. If the party leaves him alone, the NPC disappears. Otherwise, his presence continues to get worse and worse as the game goes on.
Edit: Basically the NPC gets passed around to other adventuring parties unless the player's party intervenes. The thought of other site's evil parties complaining about a codex troll sends chills down my spine, from a monocled perspective of course.