I agree with those who found it useful; it indeed is, most of the time.
Sometimes... I remember reading a question asking how we can see woolly mammoths in Thailand. (It was in Chinese and probably deleted by the admins by now.) Some other guy actually answered... that guy happened to be a spammer who took the opportunity to promote a tour from some travel agency. It included, if I remember correctly, elephants, but no mammoths.
Those are just bad apples, though... Wait, they spoil the bunch, don't they?