I’m sure Microsoft has ways of continuing to a make money with this sim. I doubt that they would allow all these third-party manufacturers to add their products to the marketplace if they were not making a percentage. I’m also sure that people are still purchasing the product as any other software and will continue to do so when it is working much better. The sim was not released as a finished product.
If they actually create a really good aircraft, I’m sure people like me would pay extra for it. As they make the sim better and better, more real simmers will purchase it over time as well.