According to a survey from McKinsey[1], in answer to the question 'Why do you upload videos?':

* 65% seek fame/want the world to see their videos

* 59% do it for fun

* 41% want to share experiences with friends

* 29% want others to benefit from their videos

* 12% do it for other reasons

[1] - http://www.aedipenavarra.es/include_asp/fichero.asp?id=35