One of the things that YouTube uses to decide which videos to show highest up in the results is the number of views that a video has received. Their computer program assumes - amongst other things - that the more views a video has, the more relevant and popular it is. This is largely true, at least until some sneaky internet marketers decide to game the system.
It's often suggested in internet marketing circles that you should buy views to your video in order to artificially increase its populari