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it costs 40 cents or $8 or whatever.  It's about the fact that a person, who should make a reasonable wage, and a business, that has overhead, have to survive.  In any business these days, $10 barely cover the time it takes to think about your order.  Often it costs as much to ship a screw as it does to ship a $500 part.  Even at the rates discussed here, they are losing money on shipping, but they do it anyway. 
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