PowrApps is a great tool to create high quality apps, is far beyond Windows App Studio but this let you install apps directly on the phone/Pc and share/sell it via Store. We may not be top developers but skilled enought to make good apps with this tool that we could share throught the store with anybody else. Like other suggested to alow non School/Business accounts to make use of this, the Store is the next step to provide more apps to the rest of Windows users.
Please read these two very motivating articles which I believe sets a good foundation for the usage intended for PowerApps as part of the Business Application Platform. Let us know if you'd like to discuss this in more detail via direct message.