There are a few reasons for this. First, dishwashers have become more affordable in recent years. Second, they are much more energy-efficient than they used to be, which is important to many people. Third, they are much easier to use than they used to be, and they can even be programmed to run at night when water and electricity rates are lower. Finally, they do a much better job of cleaning dishes than people can do by hand, and they are much less likely to break dishes.