...because most IT organisations need release management but only a handful of IT organisations need a full-time release manager...

...because to create release processes you need senior experts but to run release processes smoothly you need a mix of seniority...

...because a third-party can manage different release stakeholders with less conflicts than an employee in a position...

...because you can get release management training and release management playbook creation for free...

...because releases come in all shapes and sizes and with a managed service you can quickly adjust... 

...because if you have a managed service you control costs and resources more efficiently...

...because hiring a release manager is a higher risk of losing time and money...