Now you start to get it. Often the people who want to be judged are those who have sunk $$$$$ into their cars (be it a K-f/Willys product or some other make) either through purchase price or purchase price plus additional restoration/upgrade work. They want to get some assurance that if something happens to their vehicle they can recoup their investment just like a home owner does with their dwelling. Insurance companies deal with facts and want to be sure they are underwriting for a legitimate value. The results from club judging helps the appraiser for the insurance company to get a "warm and fuzzy" about the coverage amount requested.
Joefrazer & I gave first hand knowledge of insurance companies take on this earlier in this thread, now try looking at it like this.
Number 1 value on my Aero has been stuck at around 15K for decades. Let's say it's finished & I take it to a meet and somehow get judged at 100 points and meet the clubs assessment that it's in #1 condition. Using the above logic, I can take that trophy to an insurance company and now get a 15K policy.
Problem is, it cost more than #1 value to do a full restoration. Fortunately the insurance company(s) recognizes this and will write for higher than "book" value. My company readily agreed to value my car considerably higher than #1, wrote the policy, and it's still in pieces!
They never asked how it judged, how it would judge, how original it is or is going to be, or even if I belonged to a car club.