You need to decide why you are doing this. If you want to cover your collecting costs with profits from resales then your best plan is to buy bulk lots of things you collect and break them up while keeping the items you want. If that is the case then ignore the stuff you don't collect unless it is ultra cheap. If you just want to retail then go with whatever makes money.
The guys who said you make money on the buy are right. That is the key. At the right price you can resell anything at a profit.
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