That is normal. The merchants in Divinity had regenerating inventories, leading to an unlimited amount of gold. For Beyond Divinity, the Larians apparently wanted to change that. At least for the gold, this is reasonable. I have not run into a shortage of potions, but can see where at least some restocking of potions could be handy, perhaps at an increased price. I have not learnt Alchemy yet, though, which may provide enough potions that the merchant's limited stock doesn't matter.
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