I can only speak for my local market, you can buy a early 2000s Game King for less than that.
CEI machines sell for under $100 if not working and maybe $350 working.
Your machine looks clean but you didn’t post any pics of the inside or the board. When I sell a machine all the chrome is polished, all bulbs work, the hopper has been removed and cleaned. I always pull the monitor and at the very least blow/brush the dust off and inspect capacitors visually. You might find a collector willing to pay more. Or (I don’t mean to be offensive) but you might find someone who doesn’t know better.
On CEI machines part of the “get it working“ process should be to lift and inspect any IC that is in a socket and spray deoxit in the electrical connectors. They are known for having problems with oxidation and/or the female pin isn’t tight. Some people get the machine working by removing the board and un-doing a few connectors and viola, it suddenly works….for a few days or weeks, simply because they swiped enough oxidation off the connectors for it to make contact.
Chris