Sure, but the fixed costs are really low (mostly administrative and one-time installation related stuff which you could potentially just charge for separately) and the ongoing costs per customer are close to zero.
Also really depends on where you live; I guess for NY it’s a really good deal.
Yeah, it’s also that “it just works” now, and one undisputable (though unfortunately self-fulfilling) advantage of Windows is that chances are if you do encounter an issue you’re not the first one and someone has already solved it.
Being an early(ish) adopter of anything like that is always a bit of a risk and pain.