Sweet Jesus, this guy has a lot.
How can you keep Macs messily like that…
It is not so much of a collection as it is a warehouse full of garbage that MIGHT turn out to be useful. Usually devices that have had their cords cut off are declared scrap for tax purposes. This nominally prevents them from being resold for a profit by people taking the tax break. Book sellers do the same thing by stripping off the front covers of their books before selling them as excess to the recyclers.
Not sure it's even worth a $1,000!
Let's just say that reading the listing made me me think that this might be a "spouse appeasement" more than an actual sale. Given the pricing and attitude displayed (500 feedback or I delete you), I don't think he really wants to sell.