I feel like given the circumstances, Microsoft should probably make distribution free and collect no revenue, at least until the platform becomes popular.

There are costs to targeting the Windows platform, especially if you're doing things their new preferred way (UWP). Primarily a slow, difficult to work with development kit. Lots of mysterious crashes that you can't do much about, lots of leaky abstractions over COM.

If anything, Microsoft should be paying developers to target their store. I do personally prefer modern apps and the experience of the store, I just know not to reach for it first. As a customer I would appreciate more apps, they need to figure out a way to make the platform more appealing for developers.