E-Commerce sites such as Amazon have faceted search, where the user can refine a set of products based on values or value ranges for certain criteria.
While that is a fantastic feature, I find it odd to let the user set the minimum price along with the maximum price, as theoretically a user should want the price to be as low as possible.
The only use for it I see in excluding wrongly categorized products. For example, setting the minimum price to 100 $ filters out all the piano accessories when searching for a piano.
Are there other uses? I see it also used in appartment searches, where I don't see the advantage over just giving the highest price.