With a high risk of sounding like a broken record, and coming off as rude (sorry), I will say it again:

I can't understand why one would work so hard to bring in endless direct competition. You may make $10-100 from a popular YouTube video on "how to make money" or "this sells" but it will hurt your sales 100 times more over the course of a few years.

The barrier to entry is virtually non-existent, and 99% of people have a camera, and 99% of people are interested in making money. A thousand new competitors with 1,000 images each... That's another million images to compete with yours. Especially when showing exactly what sells. 

I know intentions are good, and as a human, I'm all for it, but as a business, protecting (trying to) one's income ought to be somewhat important, I believe.

I'm all for photography tutorials on methods and technique, but when they're constructed as "shoot this, go here to make money from it", you're just shooting yourself in the foot I'm afraid...

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Feedback on the actual videos:

They're good and well presented. You seem to have a natural talent of speaking to the camera. The voice audio is great, but I would try to find higher quality background music. In the "Top 10 Stock..." I think it's distractingly bad...

Again, I apologize for the critique, and I understand a good person just wants to help, but I feel I want to at least TRY to reduce the increase in competition just a bit.

Hey it�s all good. Your reply was respectful and constructive. And you have some great points. I appreciate it. I think you are right about not showing the best sellers. I�m going to have to think more about this. Anyway, thanks very much!

I don't want to discourage you from making YouTube videos, you have a talent for it! And of course you should put out whatever material YOU think it's right, and I know how tempting it is to make videos around the "make money doing what you love" subject, because naturally, that gets clicks. 

At least now you might think about whether it's worth those clicks, if you are trying to increase your own stock revenue.

I used to write on forums as well about where I sold the most, because I was excited about it, but after some thinking I realized what that actually does to my sales in the long run.

Now I only market to buyers, not sellers.