It seems that the author can have 2 accounts on pond. Or am I wrong. Those who have an exclusive account probably upload only unique videos there. And if you upload a unique video to pond, which is not on other sites for others, this obviously brings income. Pond is currently in decline, after its acquisition by shutterstock. Probably this affected exclusive authors too.
But here, even on the forum, we see exclusive authors who are happy with sales on the pond. Perhaps these authors shoot high-quality videos, and buyers are ready to pay big money for such videos.