When mousing over a bottle of finely-aged nectar in my sim's inventory it is showing a really low price, like around 53 simoleons. When you drag to sell the bar at the bottom shows the correct price...
Ideas
Same thing for me. Have had to remove all nectar from shelves as its selling for such a low price. Unfortunately I think food items are doing the same thing, some dishes are costing more to bake and cook than what you make back on them. Also they don't only buy one cupcake but the whole plate if you make cupcakes. At this rate my sims will never have enough money to pay their bills lol.