I mean, If i post a question and it gets like 10 or so replies then yes,
But, I've posted questions that have had over 50-100+ and i just get bored haha, Normally it involves basically typing and retyping the same responses again and again just to have the same replies again and again and ugh... I just dont have the energy or meaning to do that ;)
Though, If someone posts something interesting or such, i will reply 100% of the time, I do read all my comments though ;)
I definitely try to answer everyone at least once! Some people get more replies if we start to have a good conversation, whether or not it is related to the question I asked, haha. Only very rarely do I not reply to someone, and that's because I have nothing to say at all. That's usually because the person typed something so incomprehensible.
I try to reply to every comment, but sometimes there are too many and I just don't know what else to say besides "thanks". I always upvote them though, so that they know their opinion has been read and respected. I will only downvote if they're rude or say something totally unrelated to my question.
No I try to as well. I don't like to sound like I don't care. The only time I won't is if it's like "what's your favourite food" because well... I put my opinion. Other than nice or gross what can I say? Taste is taste!