i think you're missing the point, at least as how JT defined a hot box in the original funk board thread. it's simply a box which is *all* the records that you own, for deejaying purposes. what you put in it is up to you, but obviously since it's a one-in/one-out policy for a record to come in it's going to have to be better/rarer/newer/etc than at least something already in the box in order to push something out to be sold or traded.
the fact that records don't have to be held on to, means they can be sold/traded in order to finance big purchases... i think the original thread subject referred to the first definition of yours above though.
anyway, sorry to go on about that when the thread starter meant something else, just the hot box discussion is quite an interesting one, with the added bonus of some Trouble/Ellerbeck fighting which is always a joy to read...