SEO is not rocket science after all and you relatively simple aspects of SEO like onpage optimization or market and keyword research that you're capable of in-house.
They should understand that SEO is all about generating more business for company. https://Markets.financialcontent.com/stocks/article/pressadvantage-2024-5-16-lucid-leverage-llc-expands-revolutionary-private-label-seo-reseller-program-to-empower-agencies