Even if you don't plan on wearing eyeshadow every day, the base can be used to make your eyeliner last longer. I usually stick with a light dusting of the powder base on my eyelids, even on days that I am going with minimal makeup. I find it also helps to prevent my eyeliner from smudging.
Sometimes if you look around you can find a product that is both eyeshadow base and concealer. This is perfect if you want to be able to use your base in a more flexible way. I find it works best on very light scarring or blemishes.