A faded out and in some cases totally unreadable bezel is more desirable? Don't know how this trend started but somewhere, some European collector dictated it as a "must have" just like "Patrizzi" dials and other IMperfections and the lemmings jumped on the bandwagon.
I have a late '60s MKIV Red Sub with a virtually perfect bezel, sans original tritium pearl (got it straight from first owner) and I love it and have zero desire for a faded out or "ghost" bezel. I know not everyone can get a hold of a pristine bezel from that era but I would have thought people would be going in that direction...not the total opposite way!
As long as there is a manufactured desire, the unscrupulous ones will crawl out from under their rocks to make a few bucks.
Since this sort of stuff is hard to police, it seems you have two choices: allowing the status quo and opening sellers to the scrutiny of this forum or ban the sale of bezels that are over a certain percentage "faded" just like the police when determining what is an illegal tint percentage on a car window. Very subjective.