What constitutes "important and desirable media" is extremely personal and subjective, and the producer will not always be available to respond to your request.
Here's an example of something that is very important and desirable to me but doesn't exist anywhere else on the internet.
I agree with you overall, but the album actually does exist here: https://yadi.sk/d/SMKn5Af43LitRc. At 320 kbps, it's a little higher quality than YouTube.
By the way, Diamond Harbour is fantastic. What other music do you love?
Well I’ll be. I’ve got a vinyl copy now so I’m in good standing quality wise.
You should check out the Growing Bin web store - there are some fascinating musical rarities and curios there. There’s some great stuff on Jamie Tiller’s label Music From Memory. His mixes (available on Soundcloud) are also excellent, as are those on the Red Light Radio Soundcloud. I could go on...
Do you not realize that you've linked to a YouTube video of a recording of a vinyl record?
In your case, the vinyl record is the other source. Not to mention the other one provided by the other respondent. And a vinyl record is a great source to have -- it will last a lot longer than any other digital link to a stream of a record, if cared for properly.
Here's an example of something that is very important and desirable to me but doesn't exist anywhere else on the internet.
https://www.youtube.com/watch?v=Fd_p2B8ReqE