I'm a 'big' pc user, no less than 10 around the house. But the most of them being second hand or even older. Re-using my old hardware is a normal way of saving money. And stuff I don't use anymore is being sold again or given away to people with a need for it.
It's big companies who sell-off their old crappy hardware to wholesale buyers and then it end's up in Accra, Africa.
Instead of finding close range solutions like donating to schools, unemployed and poor they want a buck or more for it.
And I'm not even talking about companies who replace their entire fleet every 3 years.
That's just nasty to my point of view.