I have done that on some of my hubs because I thought the hub subject was important to get feedback. Those hubs also had polls on them so I requested that they at least click on a poll. And I usually add that if they choose neither then vote down the hub because I apparently didn't do a good job.
Sometimes, if I come across a hub that has no comments, I will make a comment even if the hub subject matter is not my favorite.
I don't like Apathy, and that seems to be the trend this century, and it is possibly a carry over from the end of the last century.
Feel free to vote down any or all of my hubs based on this comment alone.
At least it would be a non apathetic gesture.