The author wants apple to "Do Better" in Green/Sustainability terms, by offering More Money to buy back Last Years' Laptops. Author also stated he was planning to keep the laptop for a few more years to get his money's worth.

If Apple offers Garbage Prices for Old Models, doesn't this encourage Users to Keep Using Old Hardware? As opposed to making it economically attractive to buy New Laptops every year with Great Discounts for trade-ins?

I'm using an iPhone 6s because I can't be bothered to spend $1000 for the new models. If Apple offered me $400 tradein, a new phone would cost me only $600, making it Much Easier for me to consume new Battery/Metal/Semiconductor of a New Phone. The most Environmentally-Friendly thing for Author to do would be to use his Laptop until the Battery/Ports fail, then replace those parts, and continue using the Old Laptop until Apple no longer offers Software Support on it.