Thanks for the comments.
After uploading to YouTube for over a year on a consistent basis, I realize the following:
1. Even if people are watching my videos, they may not subscribe. Even if they subscribe, they may not continue to watch.
2. Even if I eventually get over 1000 subscribers, 4000-hour watch time and start to monetize, the earnings are likely small and the monetization will cease if I stop contributing as required.
3. By linking my YouTube channel to my fine art pages, at least some people will take a look at my photos and find something that they like.
4. By linking my photo to my relevant video, people may be interested in the context and environment why and how the photo was taken.
5. Don't forget, FAA is the only place we have the control over pricing, though FAA offers promotional discounts from time to time.
Does it make sense?