I do it, well my wife and I. We have a tiny channel, it's comfy I think.
Just over 1100 subs, with a total channel count of 350,000 views. Our most successful videos have sort of click batey thumbnails, but I really don't care about views or subs. I don't do it for them, we do it for us. The ability to go back and watch our trips again is a godsend and I watch my own videos for at least an hour every week. It's great to have a reference or something to kickstart your memory for a location. Most of my favorite videos are almost undiscovered.
Even though it's for us, we still treat it like youtube. Videos like how to get to xyz, or touring local foods, or just travel blog style. It's something that gives us goals every day, and things to do in the evenings when we travel, or on long bus/plane/trains.
1: It's hard to get your shit noticed. I would say, if you want to get started, do it for you first. Enjoy doing it and then worry about getting views.
2: Don't do one trip and try to milk the content forever. This is the classic trap of 90% of travel channels who took 6 months to travel and never found the time to do it again. They resort to videos "10 things I learned in India" and "my favorite foods I ate in Vietnam". Everything past tense because they are desperate to keep their channel going. Worse, they transition to trying to travel vlog their local area. When we finish our trips, we just stop posting, too bad.
3: Thumbnail clickbait works, like way better than it should. I find it frustrating actually. I already told my wife than next trip, I am going to do the worst, greasiest, lying, clickbait thumbnails I can imagine.
4. I always make notes of things when I am trying to research a place that have little or no info online thats easy to find. Then I try to make videos to provide that info. Make the videos you would have wanted.
Pic related: Our most popular video. India is repressed as shit and we knew we could clickbait it