While many homeowners are perfectly capable of checking their roof for damage–with binoculars, walking around the perimeter of the house–a professional inspector has the skills, tools, and knowledge necessary to spot obscure problems a layperson will miss, including any structural, sub-surface damage.
Not all roofing issues are obvious, and the absence of drafts or leaks doesn’t necessarily mean your roof is structurally sound. A professional will offer a thorough evaluation of the state of your roof/gutters, backed by experience, and provide that peace of mind so you’re not caught off guard when the damage is eventually discovered later.