So much crazy in here. Windows Desktop environment will not go away for a long time. Even Windows RT still has the desktop environment. The new Start Menu is far faster to navigate than the old one, even with a mouse. There is a shit ton of data to back it up.
The price for an individual to publish apps to the store (which you do not need to install your own apps) is $50 a year. Big fucking deal. If can't swing the $50 then make it a desktop app and get a real fucking job that gives lets you earn more than $50 a year. Apple is $100 year. Microsoft's 30% cut goes down to 20% once your app hits 25k of revenue, unlike Google or Apple where its 30% indefinitely.