That's my problem as well.
Ultimately I don't care too much if *vintage* TFs are knocked off, because there are collectors who can't afford the real thing, but would still be content with a 'stand in'.
As long as the KO can be identified as a KO, and doesn't get passed off as the real thing to unsuspecting buyers who are only wanting the real thing, it wouldn't be so bad... but unfortunately those things happen, cheating a lot of people out of more money than a KO is worth.