I don't own an expensive mandolin and probably never will, so these are based on my observations rather than experience...
It seems to me the way that a lot of folks figure out which one is the "ultimate" is by getting something they think is better and finding out it is not.
I think some of it is seller's remorse also. While they had it it wasn't quite the ultimate but after it's gone and it is too late to rethink the decision doubts creep in.
I think some people expect a bigger difference and decide maybe it isn't worth the difference in price to them. Let's face it; if you pay $175K for a mandolin, $150K of it is going to get you little, if any, difference in sound and playability (a Loar versus a DMM). I am not knocking people who make that choice just saying I can understand how someone would do it and then change their mind.
"First you master your instrument, then you master the music, then you forget about all that ... and just play"
Charlie "Bird" Parker