As it turns out, my two most expensive single knives are a pair of Sebenzas, not custom at all. My single most expensive custom is a Busse ($200+), and I voted based on that knife. If Busse doesn't count as a custom any more, then all my other customs, all fixed, are in the $100-$200 range because they are all I really need in a working knife, and I don't really buy them to collect them.
Custom folders? Would indeed like to own a few, and perhaps some day I will, but they aren't going to be any more rugged than the Sebenzas I already have, so thus far I've resisted the temptation because I don't have that kind of change every year.
Although I can't take a fixed blade to my office job (when I'm working), I live in a rural community and carrying a fixed blade around here (all day long when I'm not working like now) is no problem. I can experiment with custom fixed blade configurations much less expensively than I could in the folder arena.