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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.
So answer me this, NotLambChop. Why bother adding it as a payment? Apple, Amazon, and Google haven't done it yet.
Because the companies you've listed think Bitcoin is too embarrassing? What point are you trying to make here?

Very curious of company as successful as their's to just add it. Adding Bitcoin won't make them any real profit, Why add it?
Think deeper, this is a Multi Billion dollar company, and please don't retort with "it costs them nothing".

A rational agent should take profit, no matter how trivial, when no risk is involved. So yeah, it cost them nothing & they make money.
Not sure how this could be made any simpler.
Now run along & play your vidya.
It cost them resources & time that could theoretically be used for more profitable ventures than the thrills of a couple Bitcoiners buying Xbox Ones on their website.
Surely you're not thinking they're making any significant profit with Bitcoin as it is right now