I upgrade my iphone every 2 years, and put in a sell order with a mobile phone recycler just before the keynote for the new phone starts, that gives me the best

I upgrade my iphone every 2 years, and put in a sell order with a mobile phone recycler just before the keynote for the new phone starts, that gives me the best price (it goes down super quick once people see the keynote and decide to upgrade), and I get more than the upgrade on a new 2 year contract will cost ... win win.