Yep, it's premium to the point that's search function friendly. Apple machines will hold their value very well but it'll be weighted in favour of the basic version of each model.

I think when you get to PC parts it becomes quite a bit trickier as everyone who is willing to buy used PC parts is way more knowledgable on exactly what they're looking for. A lot of things do hold their value pretty well. On the other side of things, you're taking such a risk selling computer parts on ebay (gotta be a lot of people frying components after buying them and not even realising it's their fault) that I can see why people couldn't be bothered taking the risk of reselling when they can just gift away the parts.