It seems when RB tries to buy anything from the vendor in Sharlyan, it will end up buying X-Potions and consuming tons of gil.
e.g.:
<BuyItem ItemId="36588" ItemCount="99" InteractDistance="5.0" NpcId="1037054" XYZ="79.11792, 5.15, -46.52478"/>
<BuyItem ItemId="33916" ItemCount="99"...