Why is vegetative propagation practiced for growing some types of plants?

Vegetative propagation is done for growing such plants which usually do not produce seeds or produce plants in which viable seeds are not formed or very few seeds are produced.

e.g:- Orange, Banana, Pineapple.Also it is an easier, rapid and cheaper method and a good quality of a race or variety can be preserved even in the areas where seed germination fails to produce mature plants.