>When you shop at Wal-Mart or other store, you give them a % of profit
>everytime you buy stuff. What's the difference?

Because I can go to Wal-Mart. Or I can go to Meijer. Or I can go to Fred's Store down the street. I have choices. With the Microsoft Store being the only source for 'modern' UI apps ... no choice. It's their way, or the highway.