You don't purchase Microsoft points. You can purchase extra support with 1000 Microsoft points that you can easily get for free in like a week clicking on some links on Bing.
It's astonishing this corporation exists.
Manipulating our behavior to develop familiarity with a product by seeding the habit of using it as an ad-clicking serf and nurturing that habit by drawing it out across a series of days as the means of acquiring security for our tools and information is a coercive and corrosive exchange.
It's designed to seem like such a small thing that it's benign, as if attention is worth infinitely less than money. By changing us, forming new and often bad habits, and extracting ongoing attention interest payments without us noticing, the cost can end up being far greater.