I think the issue with that response is that [curiosity, desire, necessity] are all just specific versions of "observed value" which you are then applying to oneself. Sure, you'll have a lot of innovation if everyone is trying to satisfy their own curiosity, desire, or necessity. But you'll drive far more innovation if you have individuals who are also concerned with satisfying those needs for other people. And the easiest proxy for "someone else desires or needs this" is pricing mechanisms. Luckily, the internet / better communication methods are making it much easier to determine what is valuable to others without pricing mechanisms, but I would argue that profit motive is still the most effective method.