That tank was part of a collection I was offered that I did not get, seller never countered my offer/chose to sell it to another dealer. He got a better offer, good for him.
You win some, you lose some.
In 2026, collections are like buses; if you miss one, another will come along in 10 minutes.
Mike Jones and I just bought a huge K & C/Blackhawk/WB/Conte collection, it took Mike two trips to Yonkers and 10 hours to pack all the figures back into their boxes, we offered more than another dealer did, so I/we got that one, the other dealer did not.
Some days you're the windshield, some days you're the bug.
And it's not big secret/mystery that very rare, hard to find items are still going to sell at good money; the thousands of other very common, easy to find items are not.
That's like telling me a 67 Shelby Mustang goes for huge money; gee, shocking, never saw that coming.