> If my work is bringing in $X in revenue whether I'm sitting in a chair in an office building you're leasing or at home, I don't see why my share of that should be any less.

This is a common but fundamental misunderstanding of what determines your salary. Your salary is determined by the market, with the tacit assumption that the total revenue generated by your employment will exceed the total cost of your salary & other costs over the course of your career.