Most people use ranges to indicate flexibility, when in fact they are indicating indecisiveness. Its like shaking your head no, and saying yes. It confuses and tends to lead to extended discussions rather than shorten them.

I prefer to say "I want/need X. If you dont feel that is fair, I am open to having discussion so that we are both happy with the outcome." Sets a proper expectation and entry point for the discussion.

In my experience, ranges are an American thing. Americans, fir the most part, are polite and non-confrontational. Other cultures around the world have few qualms about putting the extremes of demands right on the table and, often, in your face. It's uncomfortable for many American business people, but it's a much more efficient way for getting things done.