No, they don't need to be experts. But I'd appreciate it if they checked their facts before making snarky comments to me, which is what I was specifically addressing, which was my point. If someone's going to debate the merits between a model in regards to graphics and resolution, they should probably know which model it is that the OP is asking about. I did, the other commenter did not. Opinions are great, but not paying attention to what the person is asking in the first place (which he did not) is kinda harming the purpose and the value of the response.
I was in sales too, for 10 years, and know fully well what is required to information gather. I gathered the OP was looking at the 15" for $1699 and the 13" for $1499, based upon what he said in the first post. Based on that, my comment of the 15" not having an edge on graphics performance (except in terms of resolution) is accurate. Why did I know that? 1 minute internet research.