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You won't even make 1 penny, if you can't break even on your user acquisition costs. That's what usually breaks a business not the fact that it's not profitable enough, but that's it not profitable at all.

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But music lessons are an ongoing (hopefully) expense. If your pockets are deep enough you can run out all the other players and capture the market.

The lessons are an ongoing expense, but the principals will rather quickly eliminate the middle man marketplace after meeting and being happy with the connection.

Unless you can provide other useful services to help the teacher to manage thier students. Maybe scheduling, accounting, payments.

In that case it seems a lot easier to skip building a marketplace and just create booking software for music teachers.

Though you'd probably find that most were happy with Google Calendar, Xero and PayPal / Square.

^ Exactly - this where 'commoditizing your complement' comes into play: https://www.gwern.net/Complement

As your niche gets smaller, you will be able to focus your marketing a bit better. This should result in lower user acquisition costs.

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