I have uploaded 130 15 second clips through black box without a single sale. All have been picked up by the four agencies Blackbox supports. Not all agencies have picked up all videos, but collectively all videos are available for sale. It's a weird sensation seeing a $159 price tag on your work.
Targeting video snippets for sale has really honed my approach to cinematography, so it was worth it from that perspective, and I still follow that approach, but sometimes I like to just wander the skies and see what's going on from above. Of course, we can do both.
There are over 10,000,000 clips available for sale. The odds of being found are not particularly strong regardless of keyword strength, etc..
Knowing the competition, I did not have high expectations. As to whether or not I will continue, probably not. I have a collection of 15 second shots, well exposed, good white balance and grading, but frustrating to watch because they are only 15 seconds without a thread to connect. It's frustrating to kick back to watch my videos only to have to advance to the next clip because the 15 seconds have passed.
I have gone back to producing short videos set to music portraying a particular location. The final product is more enjoyable. This approach is a lot more work than shooting for Blackbox, which was easy; especially if you have all 49 keywords ready to copy paste
I think that even if I were encourage by sales, I would abandon the approach as it less fulfilling for me.
If I were to return to producing snippets, I will focus on editorial, and not commercial. They pay the same, and local news is more likely to pick up a local icon, than is a producer of a more regional/national interest.
Sometimes I'll see drone footage on TV that was clearly acquired by the production company. This is clearly the case as the footage attributes do not match the main body of the program footage. To me, it sticks out; obviously...like the proverbial sore thumb.