If you read an OP and feel the question is obvious, trivial and a waste of your time -- don't allow it to waste your time.

Sure, but it has already wasted some of my time. And it will have wasted time of others as well. I understand the sentiment, and to an certain extend, I agree. Yet, sometimes people should be reminded that asking questions without looking at the documentation isn't free - it's still taking away resources from people who cannot spend the resources answering questions. And if I reply to a post with a remark that the answer could have been found in the documentation, it's not so much the OP I'm targetting (it's too late anyway), but others. If it just causes a few people to consult the documentation before asking questions, I call it a win.