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Why would a multi billion dollar conglomerate like Microsoft have to pander to such an insignificant currency as Bitcoin and such a small minority of users like us Bitcoiners?
Because it costs them nearly nothing, far less than they hope to get from (admittedly) nearly-irrelevant contingent like you Bitcoiners.
So they're using a payment processor. So what? They immediately convert fiat, we know!

They're definitely not hurting or needy for these measly sales.
I'm pretty sure they're way smarter than you, and know a thing or two about tech and business, than NotLambChop.
Large profits result from series of small profits. That's how money is made.
Now go play your new vidya.