While there is difference between business and leisure travel there is usually the opportunity to squeeze in a little sight-seeing. Even if there isn't time you can orient yourself to a new place, find out where the good restaurants are, know how to get in from the airport, what hotels and parts of town are more desirable, etc. And all the time I'm spending in the location that other people scrimp and save to visit I am getting paid and can easily return on my own time if I so desire and be far better informed than the first time visitor.