You make a good point, I was just trying to figure out how to make sure that people will try to promote the site after they receive the video. The video has to be made individually for each participant because each video has to have referral number that is unique. Paying a small fee would show the seriousness of the potential user and would serve as some sort of guarantee that they will post it . Otherwise we might spend a bunch of time and resources on making videos for people who might forget about it the next day and never even upload it to their social media. I have to do some more thinking.
I still don't know what the video is / what is it for?
If it is an invitation, it still seems to be free. Of course, giving an individual character (because the number itself is certainly given automatically anyway) will definitely add prestige.
If you don't change your mind about fee for downloading the video, then you will have to be very careful not to be suspected of paying old participants with earnings from new downloads, because that's how ponzi shame works. You must come up with some other way to pay. Maybe just increase the commission for each subsequent member acquired in the program?