I agree with you, it's a myth, there's just one comment which is similar to what the parent states, and his objection about not solving the connectivity issue is completely valid. I still use a pendrive in case there's no internet connection. Most of them are congratulations.

What most people don't notice is that many votes don't necesarily mean "everybody agrees with him/her". Many times I have upvoted comments with which I didn't agree but I thought were well reasoned and had validity because I think those comments improve the conversation.

On the other hand, I could agree with comments stating "Great work guys!" but I wouldn't vote them as they offer little to no substance.