Videos with plenty of comments rank much higher and my question to the mods is if it's possible to exchange comments here, member to member, maybe via PM's Short comments such as "Interesting [keyword] video", "Nice [keyword]", etc.
I'm sure a better (and less complicated) way to get those comments is going to fiverr and buying like 500+ comments for $5 =) It's easy, cheap and totally hands-off
Vagex or EnchanceViews It's free but if you want results it's not a good idea because if you didn't know some of them run it all day posting comments then the rest get flagged and most of them run 2 - 3 on the same IP which will also cause flags.