Little late to party and have skimmed over this. My two cents. Data shouldn't be a factor in this discussion if comparing data hoarders(Poor word choice) to streamers. If I wanted to I could stream 24/7 that would be 0.5TB per day with no limit other than the play speed of the player(One could also get this higher by skipping around in every video for 24 hours) vs downloading at 30 per week that's 0.6TB per week. The stream users can abuse your data if they wanted to.(Assuming a 20GB video typical of 8k 30 min long h265)
As for downloading I have seen videos I truly loved but never downloaded disappear from the OG producers site or the OG producer went out of business(Who knows what's going to happen to abbywinters content in the next couple of years). I prefer downloading cause personally I like freedom of choice. I can pick which player I want and set my own tags/or edit tags for videos.(Heresphere truly does make 4k content/close ups watchable)
In regards to the download limits. You should adopt something like Badoink at 20 per day and develop algos that scan for people downloading every video in your DB. 30/week just sucks as as most studios have content that varies greatly between excellent to unwatchable. It sucks when a few of your DL videos fall into this latter category. You could also stick captacha on all downloads(Naughty America VR). This will defiantly make fair use of your videos. There are other things like rate limiting per day like POVR. The only people more protective of abusers in sinsVR at 49/month and streaming limited to 1440p(YIKES) unless you give them more money. Also you got to remember 99% of users won't have the skill set or money to store more than 5TB of videos at a time that's a mere fraction of your data base. You shouldn't be punishing the majority for the few users that have the capability and money to store your entire DB
But honestly the price should be cheaper for downloaders only at your current limit. Because A) you don't have to support developing a player for them. B) Streamers are only limited in data by there willingness to sit in front of the computer.
One final note VR imo is facing a precipice there are too many choices for and most content is becoming identical(European or American style) its just now a matter of which model you want to spend your time watching. I hope SLR figures something out before raising prices as I would pay more for something innovative but not more for content that's the same to WankzVR Studios, Badoink Studios, Bangers VR, Naughty America etc.