you might be amazed at how little actual content is consumed, despite the high traffic number.

these sites get a lot of traffic(clicks and page views) and serve a lot of bandwidth(videos) but most users are just clicking around and watching just a few seconds to a couple minutes of any video they load(due to skipping). I think a lot of the traffic just people looking for the perfect scene or something new... there is a lot of junk on those sites these days.

source: i used to manage a number of high profile adult websites.