You could try asking the sellers why they are selling. But at a guess I
would point out that many, many students give up because the career path
truly sucks. Many pilots simply stop flying every year. There's probably a
different story for each one. I tried the Bose headset, it's ok. I bought
another brand.

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Anyone know why there are always so many of these on Ebay and why they
auction off for so high a price?
Why do so many people sell them if they are that good.