Why not? If high quality original content is valuable, then people will pay for it. If no one will pay for it, then is it really valuable?
And in any case, your hypothesis is disproved by the existence of free software, to say nothing of amateurs [1] in all fields. Clearly, people are willing to make valuable things without monetary incentive.
[1]: a person who engages in a pursuit on an unpaid rather than a professional basis.