How much is a love potion worth?

I'm curious, what kind of value would one place on a love potion? Is it something that can be quantified in terms of monetary worth, or is it a more subjective matter that varies from person to person? Are there any factors that could influence the perceived value of a love potion, such as its rarity, ingredients, or the perceived efficacy of its effects? And what about the ethics of using such a potion - does this factor into its worth in any way?