Value can be defined as "the importance, worth or usefulness of something." I've always defined it as whatever two people agree upon on any given day.
And today as I watched the auction wind down on this 1986 red/white/blue VFR fuel tank it had a value to me of about $200. But to its buyer that value was $731. That's impressive — I've bought entire Interceptors for less. But something about its importance, or its worth, or its usefulness (or all of the above) meant that at least two VFR guys were willing to fight it out...and it ended at the number 731.
For his or her money, there's a lot to like here: no hardware but nice original finish, very clean interior and the big one — no dents. The tank sure looks good in the Colorado sunshine. Congratulations to buyer and seller.