i sold my 2011 mba 13" ultimate for
I sold my 2011 mba 13" ultimate for $1200 just over a month ago. I have bought/sold MacBooks air/pro annually to get the latest and greatest. Actually, I also make sure to sell them before it's 1st birthday, so that they are still eligible for apple care for the next owner. It's a selling point to have it already, but since I know I'm going to sell mine, I don't bother purchasing one.
I try to sell them within a month of the upcoming revision so that I can get the most for them. Once you get within the announcement of the latest revision, the value of your stuff drops, regardless if you bought it the day before.
Anyway, that's my experience and the macbook air ultimate I had was 10months old...sold it for $1200 cash via craigslist.
I keep all the packaging and of course, the laptop in pristine condition.