Daniel,
Some people who were just getting into photography in the seventies and used Nikons were infected by the F2 cameras in all their various variants and cannot be cured so they just have to use an F2 when shooting 35mm film and really cannot shoot 35 format without one.
In the rare instance that one of these people looses a camera (usually misplaced due to mental incapacity) or worse has a camera malfunction they are forced to look for a replacement! And since the cameras are no longer made and quite old well the whole supply and demand thing happens and the prices go way up.
If you too are one of the infected people well then you have my simpathy!
PS, Let me know if you ever need batteries for F2 motor drive?