I'm sure Jeff will come up with a more complete answer, but one example is that you'll create that view, then a few weeks later, someone else will use this view to create is own view.  Then the process repeats itself a few more times.  Now you have a single view with 5-6 sorts, all of them useless.  This is also another way to tell that it's not a good idea to build views on a mountain of views.  I have no figures to give you, but the less the better.