Why is 15 reputation required to upvote?
Twice now I've googled a question and the answer has been on stackoverflow. Both times my question was answered and I wanted to up-vote the answer that I found helpful, but I can't do so until I have a 15 reputation. So here I am, asking why one must have a reputation to simply upvote? Of course, I now have a screen showing me related questions, the very first one list is "Why is 15 reputation required to upvote? [closed]", but I'm still going to ask this repetitious question, just so I can start getting reputation, so that I can avoid repetition in the future and upvote an existing helpful answer, to an existing question.