If you are talking about "See what I made?" type projects, it would not be that reasonable to pay for mine. I don't take good pictures. I don't stop and stage lighting. I don't have the time or equipment to do a good enough job. Professional quality content is another thing. If you are talking about someone putting in a lot of work to put together a "Lesson on how to do (Y)" or a detailed build diary for some project, it would be reasonable. It as worked for many years in traditional media.
Now, personally I would love to read them or watch videos of them. Now, the hard part is how sustainable is it? Would I pay for premium content myself? I personally don't have enough time to get through all the free stuff so probably not. Would it bother me to have on-topic ads to support it? Not a bit. I know that on "some other forum" that caters to CNC stuff, I have found some good info and bought stuff from their advertisers. People have to eat and electricity, computers and bandwidth are not free.
Other models such as prizes for best projects, best video, and such might be another option.