Hard to say, but I disagree that only Nevada chips remain in favor. I have reached the point where it is very difficult for me to add to the main parts of my Caribbean collection. When chips appear, I bid what I believe they are worth and am regularly outbid badly. Common chips have come down some in value (not too bad, actually), but the scarce stuff seems to be going up.
I have seen a lot of interest for other chipping areas as well - illegals, octogons seem to be rising in popularity on this board.
Michael Siskin