As long as things go right, you can make more money from acid vials than you can from anything else in DnD. It's insane. The only difficulty is getting the jug.

Unfortunately, uncommon doesn't actually refer to how frequently it shows up in game or even in the area. The Dungeon Masters Guide (pg 135) says:

Rarity provides a rough measure of an item's power relative to other magic items. Each rarity corresponds to character level, as shown in the Magic Item Rarity table.

So uncommon doesn't mean that they're going to be around a lot compared to very rare items, it's talking about it's relative power level to other items and to your character. That also depends really heavily on the DM and how frequently he gives out magical items.

Also, the price of an Alchemy Jug is fucking insane. Originally it was set at 12,000g. In 5e they removed the associated price (which is fucking infuriating) so it's left up to the DMs. However, the Sane Magical Prices guide prices it at 6000g. So you're either finding one randomly or paying a stupid amount of money for one.

If you can get one though.... the rest lines up beyond your wildest dreams. If you had an Alchemy Jug, you can make 8ozs of Acid per day which is enough to fill 2 vials. A vial of acid is also priced at 25g. I doubt a merchant is going to give you the full 25 but 15g per vial so he makes a profit too? 30g x 365 days = 10950g per year. In the PHB and DMG it sets how much money you'd make per year based off of your social level. None of them make profit, weirdly. They all only make enough to break even. The highest is aristocratic. They only make 3600g per year and it takes 3600g to pay for all the trimmings of an aristocratic life.

Life of luxury is putting it mild. You could buy the fucking kingdom.