I guess I'm just not as easily annoyed. Those posts don't bug me at all. There are many people that don't have a clue about home theater and want to get into it. Many people aren't that good with computers. Many people don't even think about the search function. Instead of picking on them and replying in a sarcastic tone, why not tell them what they want to know or politely link to another thread or article that has the information. Also, on the topic of ads, some people, like me, have adblockers and do not see those ads.
The very first forum I ever joined, PCmech, has a lot of repeat posts. One of the best qualities of that forum is that respectful treatment is required and "noobs" are not looked down upon. The whole point of that forum is to help people learn about PC's. Is the Audioholics forum not here to help people learn about audio?
Don't get me wrong, I love this forum and I am not saying the people here aren't nice. I like it much more than AVS where respect is not common for noobs. However, I see more contempt for the noobs here then over at PCmech.