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Yup. Devs like to think that sales people don't contribute real value and are basically just marketing, and that's true to a degree, but it's also true that sometimes the entire product doesn't contribute real value either. A senior dev building Uber/delivery clone #1745 run by VC funny money is "contributing" the same as a sales person, no matter how many frameworks and algorithms he uses. (Unless, of course, that algorithm is itself contributing to some efficiency in the deliveries.)