Hey! It's because I only make these available for sale when they're finished. Saffryn only has 7 scenes out of her planned 20 finished, so she's still in development. Our T4 supporters are the ones who can play these during development, while T3 gets all DLC for free once they're finished.
I don't want people to make a purchase if the thing they're buying isn't even complete yet. If I'm gonna sell a product, I want it to be a full, finished product. I just make it available for early access as a nice perk for people who support the team :)