Without salespeople you can't sell software. Without developers, you can't make software. Since we all have to pay bills, selling software is of crucial importance, but that doesn't make the developers less important. It just means that the society we live in makes those who sell as important as those who make. Just like we strive to evolve software development, we should also strive to evolve the society.
I've made software that people happily used without anyone selling it to them or me earning a single cent off of it. At my age, if I had the luxury of not having to worry about money, that's the kind of thing I would be doing all the time.