You cannot logically say what is most important to "the" buyer or all buyers, only what is important to you and what you think may be important to other buyers based on your personal experience.
I didn't mention every attribute of my site because it isn't actually up for sale.
I'm aware of sites that were niche directories or have had nice content with nice rankings but no income that have sold for thousands of dollars. So by your criteria these sites would be worth nothing, but obviously not all buyers share your evaluation criteria or these site would not have sold.
I would not know how to start a new site on a new domain in a competitive area, buy a few links and get it ranked easily, especially in Google. If you know how to do this then more power to you. But most of the new sites I see get out of the sandbox and rank in very competitive areas usually have at least hundreds, if not thousands, of links.
No offense taken. However I'd still never sell you any of my sites, as I don't think you would value then at what they are worth to me. :)
At any point in the past since I've had web sites, if I'd sold them for only one years income I would have lost a great deal of money.
As for the 302 hijack as a reason sites drop, there are some good comments by stuntdubl and PatrickDeese in the "combating scrapers" thread in the supporters forum on the logic in that theory.