Indeed. Comments can often bring to light aspects of a video which might not be obvious from watching the video without context. One example is videos which cater to obscure fetishes -- a video of a woman slowly blowing up and popping balloons isn't obviously sexual, for instance, but comments could make its intent more obvious.

the way that the video is interpreted says a lot more about the person that wrote the comment than the creator.

No, in this case (inflation) it's an actual fetish and many "non-obvious" fetishes post their stuff on youtube instead of normal porn avenues. These videos are created and distributed with the intent of causing arousal