Having gutters extend the life of your structure by diverting rain water and melting snow away from the building.
Without gutters, your building could be at risk for complications that arise from water damage. They also keep rain water runoff from the roof from splashing dirt on the eave sides of your building. This is unsightly at best.
Gutters are relatively inexpensive. On this website you will be able to immediately see how much gutters and downspouts cost. Consider this an investment, not an expense. In the long run it is well worth the price.