> You need a trained and certified Master because otherwise people new to Scrum might not know to pick hats
You certainly don't need a certified scrum master. Ideally, the scrum master should be somebody who is already in the team. A scrum master who does just that is really a project manager, and having a project manager is, IMHO, antithetical to doing scrum.
You certainly don't need a certified scrum master. Ideally, the scrum master should be somebody who is already in the team. A scrum master who does just that is really a project manager, and having a project manager is, IMHO, antithetical to doing scrum.