we spoke about this often
there are many traders whom deal with artificially aged or otherwise tampered with krises and , of course, there are many buyers prepared to pay for stuff which is looking corroded or shows " age" .
I've seen krises advertised as being from the 12th century
and of course the same (or other) krises are also sold to be laden with immense powers (as long as this add to the price)
Much depends on what one attributes to the kris and the reason why one " collects" (for lack of a better word).