Am I missing something? The point of completely free software is that it is completely free. Whether you pay for something else or not is irrelevant. The point is that you aren't paying for the thing that is free.

Another way to look at it is like this. It's like riding a bicycle, for which you do not pay gas (let's assume you want to exercise anyway, so the cost of food is irrelevant), on a road, for which you likely pay taxes. The point is that you save on gas.

Perhaps you are objecting to the fact that Microsoft Windows is not usually free?

Or are you simply stringing random comparisons together? Such as, what's the point of mustard on Mount Kilimanjaro? Or, what's the point of gravel on a rye bread sandwich? ;)