YouTubers don’t build their communities on YouTube they build an audience which they then concert to communities on sites like skool, discord etc.
There they build different incentives to people to join - masterminds - workshops whatever. This is where the value for their viewers lie and why they are okay with paying so much. The ytber provides free value on yt and then really juicy value lies in the communities.
Ad revs aren’t even the big driver of all of this.
Are you familiar with NIP-29 clients yet? It seems like they'd really benefit from having an open or even closed NIP-29 group that they can have full control over similar to Discord or Telegram
https://0xchat.com/#/
Bingo. It’s the value you can create with someone’s attention
People make millions selling services and products to their audiences
Ad rev share from YT is pathetic for most audience sizes