Second post due to character count limitation.  A little philosophy....

Dick, you have more than 1 trapdoor carbine.  One is enough for anyone so you should give the rest away to the needy.  I didn't say "sell," I said give.  They need them.

We know they don't.  Of the items in my collection, and it is rather extensive, not a single one is necessary.  None of those tools, guns, manuals, etc.  In fact, without the collector market, they're rather worthless.  They're strictly luxuries.  So I cannot be "depriving the needy" as there is no "need" for those items.  Short of selling them to collectors wanting them, and then giving the money I get away to the truly needy, there is no way I'm impacting "need."  People need food, water, heat, etc.  This stuff isn't useful in any real fashion.  It's completely "needless."

So, no, you don't determine need on this stuff as there isn't any.  It's all want and desire.  Given that, I have X amount of money for my luxuries.  I can spend it on cruises, sports cars, a fancy house, or, and this is the case, my collection.  How many of each item I decide to have and what those items are is really my choice.  It's my money and my time.

I am not, and it's patently obvious, harming anyone's need.  If I used that money to drive up the cost of food or housing I would be. 

I'll buy what I want in the quantities I want.  I don't "need" any of it.  My needs are actually quite small overall and my fundage for luxuries is quite good.  Which beats the alternative.

If you're really concerned about "need" go ahead and sell your collection.  All of it.  Then donate the proceeds to a soup kitchen.  They have a need.

Myself I'll spend my money however I wish.  If I'm particularly good at finding the stuff that interests me - great.  Which I am so that's good.