Wow. So, I can't have access to the high-quality videos that brought me to SLR in the first place by being a member? There isn't even an option to upgrade my plan. And I don't understand why you think encoding a video file will do anything other than reduce the quality and size. AV1 might be great for your bandwidth costs, but any encoding is just removing pixels from the end product.
There's zero mention on individual pages of what resolution is underneath the "Buy" option. What a disaster. I hope you reconsider. Not sure why folks would choose to subscribe if the quality is dropping to that of inferior studios as a subscriber.
If bandwidth is killing you, then implement something like you did with scripts where subscribers can only download X number of original bitrate videos per month. I have zero interest in subscribing to a site that only offers inferior quality to their subscribers, our eyes notice the difference, and we're trying to recreate reality here.