While I've never owned any of your custom knives, I have owned some of your collaborations. That said, I want to get a good sheath with my custom knife. I've gotten some great custom knives, with horrible sheaths. Not just a great looking custom knife with a ho-hum sheath, but actually poor sheaths. Looked like they were slapped together at the last minute. I gladly waited for a custom sheath for my J Neilson Kephart, after J sent it to the sheath maker (embarassed that I don't know who it was off the top of my head, I believe it was Paul Long, his ex-wife made great sheaths too).
Take for example Daniel Winklers knives. They are beautiful works of functional art, but the package would not be complete without Karen Shook's sheaths.
What I really don't like is when I get a knife and great, no frills, well made sheath from a maker, and then order another knife, and get a great knife and a crappy sheath.
I am not looking for ornate cross draw loops etc. and designs, just a well made leather sheath.
I do think that all custom fixed blade knives should be offered with a sheath, although I have been told by several makers that making a sheath for the knife is not a priority. I have bought knives without sheaths, but always tell myself that next time I won't.