@lonesamurai1: If that was Microsoft's end goal, then letting their games be playable on PC was a bad decision, don't you think?
Their "biased obligation" is to sell their products and services to consumers. Windows brings in more revenue than Xbox does, so it benefits them more you using PC over Xbox.
Either way, any company's goal is to get you to use their products. Apple would rather you buy an iPad to go along with your iPhone over any other tablet, for example, so why is it a problem for Microsoft to tempt you in with their other products?
ReadySalted's comments