You just detailed the reality behind a situation that had appeared surreal. To the best of my knowledge, that's a first here. That big of a jump in selling price is something that cannot be predicted with any certainty. Such quantum leaps happen when they happen, as unlikely as they might seem. We've also seen a LOT of outright squirrely bullshit in the marketplace. I try to remain pragmatic, which is why I withheld judgment until now...when you've rendered it about as useful as an appendix transplant. The fact remains that a commodity is worth whatever someone is willing to pay for it, no matter how unlikely. That, in a nutshell, is my point...facts are indisputable; feelings don't matter. A lot of folks overlook that completely...and that is part of the auction experience.
Bottom line, congrats on setting a new resale record. I wouldn't expect the bar to suddenly leap that far upward, universally, for ultra-low-mileage "proof" bikes. If that were to happen, there'd be a CT70 bubble. OTOH, even though it is a big jump, that's only viewed from a short-term perspective. There were a few similar examples (a couple f them were even CG) that changed hands north of $5K, circa 2002. $10K, a dozen years later, is an annualized appreciation rate of 6%; that's less than the real rate of inflation. And, between `03 & `07, especially, values for bikes & parts, plummeted in dramatic fashion. They've rebounded slowly ever since then. If one were to plot market prices over a course of decades, the graphical representation would appear fairly smooth...a long, graceful, arc. But, memory & human nature being what they are, trends rarely progress smoothly & predictably, over the shorter term.
Speaking from the viewpoint of one who's been into this for a couple of decades, now (and the car side for better than twice as long), these bikes are following a familiar (sometimes bumpy) path of a true collectible classic. IMO, high market values are a good thing, across the board. They'll pull more enthusiasts and parts suppliers into the scene, ensuring it's continued health for many years to come. That's more grins for all who enjoy small Hondas...and the world can use all the extra grins it can get.