The question "How much is this worth?" is an inquiry into the financial value of a given product or service. A seller wants to understand an item's worth to price in accordance with market expectations. Buyers want to know worth to get fair value on a purchase.
Different customers may place a different worth on the same good or service. Businesses often price items at the market value that attracts the highest volume of customers while maintaining a reasonable margin on each sale. If a company's overshoots what the market believes an item is worth, it will not attract enough business.