I agree that there is a lot of the same “stuff” floating around. I do think that it is inevitable, however, that many people are experiencing the same things. Yes, some do post with motives of only bolstering their site traffic and email list, but I do think it would be unfair to tell someone not to write something because someone has already expressed it.
In all reality, the same stories stories have been being told for thousands of years … just in different ways. What makes them great is the voice that speaks them. All in all, create to say something meaningful, not to gain a following.