It seems, by your rationale, the reason online consignment shops are superior to a site like etsy or ebay is that they offer a niche market only for knives, and the knives don't get lost in the sea of other listings. This brings true knife connoisseurs to the sites because they will be able to browse custom knives, and not get distracted with other things. There are also a number of consignment sites that have been around for many years and they have a footing in the industry, while sites like JustCustomKnives.com and CustomMade.com are relative new comers.
However, it is my view that consignment is an old idea, and in time will be displaced by a superior alternative. You say that "exposure for your custom knives to worldwide buyers who are willing and able to purchase them for what they are worth". That doesn't seem to be a benefit of consignment, but more a benefit of the Knife Purveyors of the world having a footing in the marketplace as they have been around longer.
The traditional Knife Purveyors for the most part have been able to get a footing in the marketplace by having inventory to offer as a result of consigning knives.
For me I still prefer to pay less then 25% commission, or none at all, though to do that I agree that you need people looking at your knives that actually want to buy them, and for that I'm looking for alternatives to consignment. It sounds like your experience with selling knives online was earlier in your career and perhaps you don't have much experience with this new breed of websites where we can sell knives?
I just don't see that the 'new breed of websites', as you call them, have much to offer.
Even thought I have my own contacts now and sell my knives, as I adjust my collection from time to time, via my collector website, I still follow all the major custom knife purveyor websites to help me keep in tune with knife values. I recommend all collectors who are interesting in tracking values to do this. Newer collectors can especially learn quite a bit about custom knives by following the better Purveyor websites. Guys like Dan O'Mally, Dave Harvey, Michael Donato, Dave Ellis, Paul Shindler just to name a few are among the most knowledgeable people in the custom knife community.
I have very little experience selling my knives, as I'm a newbie, but I have to believe something like Etsy.com (alot of traffic looking to buy) or JustCustomKnives.com (niche and free) will be a solid option in the future, as I don't wanna have to ship my knife off to a 3rd party, and then wait for them to sell it, then send me the money, only to have them take 25%...dunno.
I would not buy from a website that didn't require custom knife owners to ship their knives to them.
How can a website represent the knives they are offering for sale if they have never seen or inspected them?
The good purveyor sites hold your knives for good reason while they are listing them for sale.
They have to have them to take good quality photos of them to insure maximum results.
They have to have them to for inspection to insure they are in condition as represented by the owners.
They keep them on hand to insure quick and efficient shipping when sold.
What is your experience with the Blade Forums marketplace (not to bring heat to you)?
The BF is a good place to purchase knives however not so good a place to sell them IMO.
Typically members list knives at market price then continue to frequently drop prices until knives sell.
Potential buyers often hold off pulling the trigger anticipating further price drops resulting in knives selling less than if owner
had chose other methods of sale.