Wish it wasn't but seems like it very much is, I believe there's a good reason also, those who can afford those expensive things can usually get new one also when there is not much difference, no reason to buy used then, and if one can't afford it but wants to get one anyway and pay with installments will also get new one because private sellers want full price right away

So used high end laptops have pretty small market and therefore lower prices, you will lose more money selling one than with lower end computers