The purpose of gutters are to provide a path for watter flowing from your roof of the ground. If this pathway isimpeded, water can be pushed up under your roof and into the walls of your home. This can lead to costly repairs.
If your gutters are weighed down with heavy debris due to a lack of cleaning, they can collapse. New gutters are a lot more costly than having them cleaned.
Having a build up of leaves and debris create a cozy home for small animals. Small rodents and birds can begin to live in your gutters and even make their way into your home.
You want your home looking good for curb appeal. Your home will not look very nice with overflowing gutters.