I think if you added some post-production to the older videos, and made sure the transcripts for them were really well edited and convenient to find and search,

I think if you added some post-production to the older videos, and made sure the transcripts for them were really well edited and convenient to find and search, etc, this would be a great idea - you would be curating something of real value, and I would totally pay for older stuff if I missed it. Of course "how old" and "how much" are very important questions ;)