There are many reasons I prefer 540 or even 480 over 1080 and even 720.
I have a few files that are 720p (and even 1080p) but I convert everything with handbrake.
Not only is it redundant (we're not watching movies, the colous don't change much and the background is neutral.. Size is one thing, but that alone would not stop it.
The truth is, I have no seen a single 1080p video I liked.. there's too much detail to distract..
People look better in 540p. Not to mention, I have come across plenty of 1080p videos with 128kbps audio... where is the sense in that????
I don't even even like the majority of porn, but even without james deen on the screen the details are too crisp... I don't wanna see so many "flaws"
There are enough sweat pimples in tube flv quality for crying out loud.
Just my preference. 540p is the sweet spot; delicious and detailed. HD is realistic and you can almost smell the sweat and bile and nah son.
Some gagging is good in 720p but a lot of it is worse. Again, depends on the scene. I always prefer 540p.