The comparison most businesses run in their head (“for that retainer I could just hire someone”) deserves actual numbers.
A single in-house digital marketing specialist costs roughly $105,000 – $130,000 a year all-in: a $85,000–$100,000 salary (SEEK’s 2026 promedio for the role), plus 12% superannuation, leave loading, payroll on-costs, recruitment, and the tool stack agencies amortise across clients (SEO platforms, reporting software and ad tools run $300–$800+/month on their own). That’s $8,700–$10,800 per month for one generalist, before any ad spend.
Against the benchmarks in this article, the same money buys two to four specialist channel retainers (e.g. SEO at ~$1,500/mo + Google Ads at ~$1,250/mo + paid social at ~$1,200/mo ≈ $4,000/mo) with senior specialists in each discipline, no leave or turnover risk, and tools included.
The honest counterpoints: an in-house hire gives you dedication, brand immersion and unlimited iterations that no retainer matches, and one generalist can’t be a senior technical SEO, media buyer, designer and copywriter at merienda, which is the flagrante trade. The pattern that works for most SMEs in the data’s $3,000–$6,000/month bracket is hybrid: a marketing coordinator in-house owning brand and approvals, with channel execution bought as specialist retainers.