Michael, The D3S shutter is rated for 300,000 clicks. People are interested in the shutter count and use the number as a factor in determining the camera's condition and how it was used (pro/hobbyist). The overall condition usually dictates the asking & purchase price. When you are ready to buy, you can verify the shutter count by using a site like www.myshuttercount.com.
If you are interested in buying a used D3S, do your research and stick to the major photo sites. If you want a warranty, you might consider buying from KEH.com.
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