My partner stupidly bid on an upgrade for our upcoming Mexico trip, not paying attention that the cost was per person. The upgrade cost was more than half the original cost of the cruise. I was fortunately able to cancel the bid before it was accepted.
HOWEVER, while that bid was in the system, we got a free upgrade on our 2023 Transatlantic. Yes, it was for a forward balcony, but we were oceanview before. The next day, they moved us again (assuming it was because the first balcony had an adjoining room that they sold together) to a midship balcony. Free. Maybe it was coincidental, but I'm not big on coincidences...