Unfortunately that's not how it works. Much like a personal trainer at a gym, a tennis coach, a spanish teacher, or literally any other teaching/tutoring profession in the world, that's just not the format!
The main reason is not just that so much of your success depends on you putting in the time + effort, but also because, from a legal perspective a coach has literally 0 firepower to chase you for the money if you don't pay at the end of the engagement. International law won't help a coach force debt payments on a non-payee (it's why hacking and scamming attacks are growing rapidly). Even if they're in the same country/jurisdiction, the costs of pursuing the payment are far too high to make it worthwhile.