I see that very few people upvote or like posts by other people. If you ask for help and someone helps you then you should like their post to encourage more posts from them. If you see an interesting post on a thread you arent a part of then like that post to encourage more posts from them! If you ask a question and someone answers, like it! If they solve your problem then mark the thread as solved!
Liking posts is the very least you can do when others help you and I think they wont help you or rest of us if they dont get even basic internet points for helping. Dont be selfish and show appreciation for those who help!