I agree with you @barski
I choose silence as well not to comment on things I don't understand. You will only say what you understand, right?
You are also right, that what we should do is the comments we give are not meant to be taken into account. We're just doing it to give another perspective from our point of view. If it can be of use to others, why don't we do it?
About someone who appreciates the opinion we give and that person gives us an "upvote", it's just a matter of the bonus we receive.
What do you think?