As you probably know, Adobe purchased Fotolia as a way to establish a strong presence in the stock content marketplace. Fotolia continues to have strong sales and is slightly different than Adobe Stock.
In the case of video, Adobe Stock currently offers two products to sell (4k, HD) and Fotolia offers five (4k, 1080, 720, 480, 240). The lower resolution and frame size comes with a lower cost.
If you received a lower royalty, then it is due to a smaller sized clip that was purchased. Ultimately, having the two marketplaces today offers our contributors two unique offerings in which to publish and promote their content.
It would appear then that all my Adobe sales are through Fotolia's website.
Is there any way to prevent Fotolia from selling my videos at resolutions below 720p? Getting $3.60 for a sale is just depressing and I'd rather not sell my videos at that price.
I seems you didn't answer the question: "Are most Adobe Stock buyers only buying low resolution content?"
There is not an option to opt out of the lower resolution sales at Fotolia.
There are no low resolution sales at Adobe Stock at this time.