Are Let Only Agents Missing Out On Potential Income?

I read an interesting article earlier this week which was reacting to an ARPM report suggesting Let only Agents were losing out on significant income by not offering Full Management services. (https://www.propertyreporter.co.uk/landlords/new-research-reveals-let-only-agents-are-losing-80-of-potential-income-per-tenancy.html).Of course revenue is a hot topic at the mo