This is a somewhat hastily written reply to https://hachyderm.io/@esk/113793277371908181 .
I disagree a bit with Esk's finger-in-the-air estimates for number of staff required, their location, and their costs, and it didn't really fit in a single post or thread. In particular, I think it undercounts the number of people required to run the service, and ignores moderation.
As you'll see when you read this there are some big gaps in my knowledge around some best practices, particularly around moderation, so this is absolutely a draft. If you know more about this (or other topics) covered here and can suggest improvements then please do.
So, you want to launch a professionally run Mastodon service. How many people do you need?