I saw What is the largest prime number? asking what is the largest prime number, which got obvious answers like "there is no largest prime" and "well, the largest KNOWN prime is..." But the question was clearly phrased in a way that the OP thought there was some bound on all prime numbers. Probably the question is a duplicate of questions that ask for proofs of infinitude of primes and ask for the largest known prime, but that aside, what is the motivation for giving upvotes to such a question? It received a higher than median number (4 the last time I checked). All you have to do is google prime numbers and find out that they are infinite, and most people already know this fact anyway. So it doesn't seem like the question contributes anything worth up-voting much to the forum. Is there something I don't understand about the current culture of up-voting, like something about the majority of the users who are doing it?