Hm, I wonder why I should buy and resell a prop, that I dont want...
Of course, there could be an interest loss over the years, but i keep the main stuff...
I think sometime you have to be lucky, sell anything what everyone wants to have, what you dont want to have... Or you know you can make it again, if you make it. Or you know from a top secret source, that a new version will be available...
I think some props go up in price, if they sold out. Some go down if something new comes out...
Its not as easy as everyone thinks...
My problem was: I bought the stuff at the beginning of my collection... My hoverboard was $350, now I can get a better board for less, but my old board is collecting dust, because everyone wants one of the new boards, no-one wants one of the old foam boards...
Same here with costumes. I really don't think I ver get the price I spend into my Jack sparrow costume, because now there are better parts our for less... Thats the problem...
A good time to get the stuff, when no-one is interested in the stuff anymore...