The number of the "Likes" are very important for us.
Lets imagine: if we would like to nominate an uploader for Elite membership - what is very important for him - than we are able to count the number of the likes, but unable to count the number of the comments...
Likes are the best feedback for us.
+ simple comments without likes are possible "bumps" - what we do not like
... so come on, and push that button guys...