No 6-800 is about right.   A fully restored version could go as high as $1700 but that thing is a POS.   Cracked marquee.... jacked up control panel with buttons sticking up and washers covering drilled holes.... a ms-pac man joystick installed instead of a Nintendo one.   ect.   Of course their "expert" is useless as usual, but he did stumble into the correct price range.