You pay market price for oxygen. It just happens to be 0 right now. There isn't any reason in principle that price can't change (eg, if you want to go underwater getting the oxygen will most certainly cost you something, if you want your air at a certain temperature or humidity that costs you too). If we set up a moonbase or something then it might well be that oxygen would cost something.
Much like how there isn't any reason you have to pay for food in principle. It could become so cheap and easy to produce, say, bread or cheese that it is available everywhere at no nominal cost.
So yes, you should. You already do, realistically.
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You pay market price for oxygen. It just happens to be 0 right now. There isn't any reason in principle that price can't change (eg, if you want to go underwater getting the oxygen will most certainly cost you something, if you want your air at a certain temperature or humidity that costs you too). If we set up a moonbase or something then it might well be that oxygen would cost something.
Much like how there isn't any reason you have to pay for food in principle. It could become so cheap and easy to produce, say, bread or cheese that it is available everywhere at no nominal cost.
So yes, you should. You already do, realistically.