Managed Services as Insurance
Consider the cost of hiring an employee vs. the cost of managed services. The decision to outsource a professional service is similar to one you already make—getting insurance.
When it comes to IT, the nature of the field is that sometimes there’s a lot of work, and sometimes there isn’t. A good provider’s fee structure will take that into account.
The best-fit provider will have experience with your type of business and the mix of technologies you use. They’ll know the right fee to charge per employee to provide proper services. Some months they’ll make money. Some months they’ll lose money. But over time their fee should average to a reasonable expense for your business. It should allow the provider to make a reasonable profit and provide the excellent service you expect.