Very important and interesting way to earning for independent filmmakers. This is similar like YouTube policies. But there are many negative expressions among indie filmmakers about this feature. We will see in the future, what this will be bring. To activate this, you must be a Vimeo Plus or Vimeo Pro member.
Pay to view on Vimeo:
Great info about this feature: http://nofilmschool.com/2012/09/sell-videos-on-vimeo-tip-jar