Frac,
Your requirement is $10,000+.
I don't know if any of the makers listed get $10K. I know they have gotten in Excess of $5K. So has W.D. Pease as well as John W. Smith.
Makers in excess of $10K:
Ray Appleton
H.H. Frank
Michael Walker
I sold a pair of Bill Moran Folders for $25,000. Although they did not sell initially for that when Bill sold them.
Usually these knives will feature engraving and other special touches.
Tim Herman did a folder with Opal scales a few years back, that may have topped $10K.
Most of the makers who get even $5K for a folder, this is ususally pre-ordered. Lets face it, how many buyers have the "spare" $5K in their pocket.
Some of the buyers have been around for decades buying knives. Others collectors are new and have a lot of money. Unfortunately, many of the buyers are taken advantage off because they get the "fever". They are around for a year maybe 2 then they are gone.
Of the list mentioned, I have only seen Herman and Smith on the forums.
They both, along with WD Pease have web sites.
Purveyor's Dave Ellis and Gary Levine in particular have some of the aforementioned makers work.
In person the best place to see these makers are:
The East Coast Custom Knife Show
The Knifemakers Guild Show
Phil Lobreds Art Knife Invitational (every 2 years).