Because, everyone knows you just have to hit Esc-Meta-Alt-Ctrl-Shift-$.

That's just my .

I don't suppose that will cover the ahem, fee to avoid massive downvoting, will it?

But seriously, if we yanks demanded both $ and ¢ on our keyboards and started using the latter in some computer language, those nice folks across the pond might complain that £ is already on their keyboards and should be used more in code, or those across the lake might want to see ¥ used more often. Pretty soon our keyboards will be the size of surfboards, or we'll have to add a few more Apple-Windows-Function buttons.