A real collector would keep an antique fire truck in a garage or barn, waxed, polished, and ready to drive in next year's fourth of July parade. The hoarder merely allows these things to waste.
UPDATE: I forgot to mention SHIPPING CONTAINERS which many people in rural areas think are swell storage sheds. Problem is, a used shipping container, sinking into your back yard at an odd angle basically devalues your property by thousands of dollars as it is an ugly eyesore. It also is a crappy place to store things, as they get ungodly hot in the summer and most of them leak water (which is why they were sold off in the first place). Just say "No" to used shipping containers as well.