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TemporaryName Pornhub, xvideos, xhamster, etc countless other aggregate sites exist. I don't know the numbers, but I'm pretty sure most people just go to pornhub than pay for a bunch of 2D porn sites. So at least people are paying subscriptions or fees here.. not sure how pornhub and the rest are making money or paying studios.
Those tube sites primarily make money off ads and save on costs by serving the lowest quality they can get away with. Different model to SLR and not really comparable to standalone porn sites. I think tube sites appeal to a different market than standalone sites.