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In the Warehouse used section there are 3 available units - over the past 5 days they've jumped up $140!

Anyone know of a reason for this? What are these prices based on??
The prices of various sellers on Amazon defy common sense. A camera strap that the manufacturer lists at $29 is sold by Amazon for over $60; another Amazon seller has the $29 price, "marked down" from $169!! Other camera items (including cameras and lenses) that sell new on Amazon at one price are listed used on Amazon for hundreds of dollars more! This is true in all product areas. For example, I have a surf book on Amazon, new, selling for $19.95. The same book is listed (right now, today) used at $58.88! There is no rhyme or reason to the pricing.