Has anyone ever actually sold the stock RAM they've replaced in a Mac? I have a box full (well, ok, six sticks) of RAM I've pulled from my Macs, and I can't be bothered trying to sell them. I can't imagine I'd get much for them.
Since my wife's and my employer both have Apple store partnerships, we can currently get Apple-installed RAM for $135 compared to $140 from Crucial. Although I'm not in the market for a new Mac at the moment, I know what I'd do.
Of course, a couple months ago (and when I bought our Macs), it was different, when Apple RAM was 2x or more the cost of Crucial's RAM.