I'd like to say that I honestly think that you are wrong. Last update I subscribed to the 20$ tier and I think that for me at least it's not worth it. I changed back to the 10S tier precisely because of something related to what you've said, generally one would think that indeed the developer hides the best scenes behind a paywall but i think that's absolutely not the case here. What determines how good something is is profoundly subjetive, but the objective quality (unique moans, panting, scene configuration, portraits, etc.) of the normal scenes are better than the extra ones. The extras are just that, nice extras, if you have a particular deep interest in a character that is used in the extras then it may be worth the 10$ gap, but I don't think you are losing "the full experience" if you don't pledge to that tier, far from it.