Is it worth it to hire a marketing agency?
See above — it's worth it when the marketing capacity gap costs more than the retainer. The bigger question is whether the agency has actually done what you're hiring them to do. Ask for case studies with attributable results (revenue, leads, ranking improvements — not "engagement lifted"), ask who specifically will run your account, and ask what happens if the first 90 days underperform. A good agency answers those cleanly.
Why this matters
This question shows up regularly in Google's People Also Ask for the "marketing agency" query, which is a signal that buyers in this space are asking it constantly during their research phase. The answer above is written from The Wall's editorial position — we index 2,286 verified US growth-services vendors across 10 pillars and see how these questions map to actual buying decisions.
If you're evaluating vendors in this category, the Marketing pillar page has the full US firm list with rates, team sizes, and headquarters filters.