That's nothing, some nob paid $2000 for an NES cart a few years ago.....the fool
Who you calling a fool... 
Naah, just a few months ago an original copy of "Personnal Software" edition of
Zork went away for $2495. A bit later an
Starcross unit, with the flying suacer box new and sealed was sold by the same vendor for the very same price.
I'm an Infocom collector myself, but must just keep to what I can pay, which generally means the less rare and more affordable standard grey-box editions.
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