Making the company money is the not the only factor is it? Any engineer at google/facebook/etc are probabilistically making the company multiple millions per year too (terrible estimate from revenue divided by headcount). But probably only a handful of them would ever be able to demand the rate you charge because they are replaceable.
How do you make sure the company won't just take your advice and hire a guy to do this for 90k/yr instead of letting you work on it for three weeks?
How do you make sure the company won't just take your advice and hire a guy to do this for 90k/yr instead of letting you work on it for three weeks?