Crazy Math
That's some crazy math there. Maybe this place is getting to you too?
You trade in the jug but nothing else: 10000 gp.
Moth trains up: 9250 gp.
Marivhon buys 10 Healing Potions: 7750 gp.
Marivhon buys the Twenty Potion: 5750 gp.
Marivhon buys 2 Speed Potions: 4950 gp left.
Extra-Healing, Dwarf Control, Polymorph, and poison still for sale.
You ask around about what to expect upstairs. You roll on the rumor table and learn that Irwin Fester, the Court Magician, often visited the Kitchens for a late night snack. Also, the High Priest of the Jug, Father Salisbury Greyhelm, was trapped upstairs in the Workshop. Apparently, he had a prophecy of doom and was trying to build a great weapon to defend the castle. Finally, a few of the townsfolk headed up to the Ballroom to see about getting some help, but it was suddenly covered in dust and cobwebs, and they heard a noise, so everyone ran back downstairs.
If you want, go ahead and make a CHA check to learn extra rumors.