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Wouldn't it make sense to lower prices of videos after a set amount of time? Say after 3 years the prices get a reduction? How many scenes get bought after a few years?

I agree, this would be a great idea to boost the back catalogue for the bigger studios, and offer more value for a monthly sub (especially as your ticket allocation doesn't go far when scenes are around 9 tickets each). If you want the brand new scenes, you pay a premium, older stuff gradually reduces in price.

That said, prices have been going up so much anyway year on year, that if you go back 5 years or so things are naturaly cheaper anyway.

it's up to the studios they can have have sale once i a while(e.g. actress's birthday)
although apart from Giorgio Grandi,Gonzo ->both of them have huge Catalogue of scenes
rest of the studios are new so going for a sale wouldn't be possible for them

Yeah, they used to do this.
And those glory days of free tickets