Quoted from Pecos:

When do you sell your favorite pinball? When you are offered three times what you paid for it.
When do you regret selling it? Forever, or until you get it back!
My high score was on the last day before I sold OXO.
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"I was working at Hughes Aircraft Company at the time and I met someone there who became interested in my small pinball collection. By this time I had acquired in addition to OXO and Expo a 1975 Williams Pat Hand. He particularly liked OXO, being the intelligent person that he was, and wanted a price. I had done quite a bit of work on OXO, though in retrospect the amount of work was small, and OXO felt like my machine. I didn’t want to let it go. He threw a wild price at me, $1,000. And so it happened that OXO was torn from my loving arms. It wasn’t long before he had the other two pins as well.
"It was just a couple of years ago when my friend and I discussed the money that he owed me. I wanted the money but accepted OXO and Expo in exchange to wipe out the debt."
You can read the whole story here if, for some reason, you are bored out of your gored:
http://www.pecospinball.com/OXO_and_XOX.shtml