Ha! No, it's just that I basically do research for a living across a broad number of topics I know little about initially..... and did a fast drive-by on what I could Google. And I think the conclusion I came to was this is very very similar to his two small planes, that there is a huge variability based on options and conditions I don't know anything about, and really couldn't without having followed their history for years in forums and such.
The instrumentation on one of the planes could have changed the value of it by something like the value of a new Toyota. And the differences in the motors in those things just made me dizzy... the different power plants that were possible, the importance of the number of hours on them etc was something I wasn't familiar with, when it last had an "annual" and so on.
In short, I figured out enough to know there was a lot I DIDN'T know and probably couldn't without spending months on it and really getting immersed in the world of experimental aircraft and aviation generally to the kind of level possible maybe only for people who are really in love with, in this case, a type of plane called an RV-6. This is the same, and I suspect the variability in Bruntons may be even more complicated?