Video sale for 3,92?

Prices vary depending on demand, region, currency and the Stock plan customers have.  

Don't sweat the small stuff.   It's not how much you make per sale, it's how many total sales you make that counts.

Focus on the big picture which is developing a good portfolio of diverse content that more people want to buy.   More content = more sales potential.  😊

Your images do not have a set price. The royalty that you earn on a particular image depends on what subscription plan the Buyer has chosen. Therefore, you might sell an image for $26.40 one day and $.33 the next day. You should familiarize yourself with the royalty structure so as not to be surprised or disappointed regarding the royalties you are earning. 

https://contributor.stock.adobe.com/en/royalties

On the flip side, so many creators have access to your work; our work. The days of making big dollar stock sales are not over, but the competition is fierce, so we are forced to work harder and smarter.

Prices change. They can go up or down.That's life. However, I was offered it for US$199 just now !