Remember that you can buy weapons back from any trader in case you need them (and provided you can remember whom you sold them to), but armor is another matter: usually the trader equips any good piece of armor you sell, and the only way to get it back is either kill him or sell a better (more expensive - not better in quality terms) item so that the worse one you need is back on sale.
Creeper doesn't play these tricks, so you can use him as a pawnbroker - should you need that thing, just give back the money.
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Never attribute to malice that which can be ascribed to sheer stupidity
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