To be honest I have not had the time to think about trends.
In terms of ups and downs, you have to remember that we record values as finite numbers, which are then translated to the value codes. Many price changes wont therefore cause a change in code. So where I reduced maybe 2000 LE chips, only a few hundred of those will translate to a '-' sign. I cant recall increasing any LE's, only reducing.

The trend is up on better ncvs and mid-range $1's.

The rest is a mixture. What we found surprising is that when looking at a lot of chips that you do see over and over (typically in the $25-$75 range) there is always criticism that "they only sell for half TCR" etc etc. yet if you look for example at all known ebay sales including fixed price items there are many more sales at close to book value than you would ever imagine.