Free porn is free porn, for a surfer it doesn't really matter if it's an MGP site or a Tube site. The average guy watches about 2 - 5 mins of porn before he cums. So if he goes to an MGP he watches a few 1 minute clips, and if he goes to a tube site he watches a few minutes of a full length video. So all tube sites do is making it easier for people to watch free porn, but that doesn't mean they won't spend money on porn. For example the surfers from youporn spend $1000s every day on porn. So even though they can get 1000s of free movies, they still spend of money on porn.
(Stolen content is a completely different issue of course)
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