I happen to have a contract in front of me for next years Blade show seems that I do not see anything about a maker needing to bring knives for sale.
There is a big difference between advertising and a contract. (I know you are quite aware of that.) So I do not think the promoter's advertisement holds any water to your argument.
There is not a moral obligation for a table holder to have knives there.
There are plenty of makers who make less than a dozen knives a year (mainly because it takes them a month or more to make one knife.) They go to Blade with no knives to sell. I am glad they do. In most of those cases waiting lists are years long.
In another thread someone states that it is not ethical for a maker to have knives at a show when they have a waiting list. That does not wash with me either. Seems that a popular maker can't make their own decisions about the way they earn their living without violating someone elses definition of "moral obligations" and or ""ethics. As long as they are not violating their contract, my point is that they should do what is best for them. As far as the wording of an ad. that is altogether a different story.
I am not twisting words at all.
It is a silly and demeaning statement to these makers to say that they have a moral obligation to have knives for sale when they go to a show 
.
Lets start at the top of the list. Next year why don't you stop at the first table you see on your right. It will be Bill Moran's. Tell him he is not meeting his "moral obligations". I have been going to Blade for a long time. He has always had a table. He has never had a knife for sale (at least in the last 10 years.) It is always a highlight of the show to me to see his knives and the knives of others who have nothing to sell. You will be able to say the same thing to quite a few makers. I hope I have clarified my point about the "moral obligation" to have knives for sale at a show as being silly and demeaning to makers who do not have knives for sale because I do not have anything else to offer to convice you otherwise. By going to a show they keep the intrerest in their work stirred. That does no harm that I have seen over the years. The
worst choice that they could make for thier future is what you espouse (indirectly) that they should not have a table.
You have essentially stated that if they have no knives for sale they should not get a table at a show unless they want to violate some "moral obligation". (Substantiated by the wording in an ad.) So what you are telling makers who have long waiting lists and strictly abide by them is that they should not hold tables at a show. Sorry that still does not wash no matter how you wish to twist it around.
added later during the evening.
I know of at least three makers in that position who feel "morally obligated" to purchase those tables stand there all weekend meeting folks and displaying some of their work that is in private collections. It is cash straight out of their pocket without return since they do not need the business. They are there for the passion of what they do and others that share that passion. They do not care if they take an order or not as far as the money. They are doing the right thing as far as I am concerned. The right thing for themselves, their fellow makers and collectors.
I am open to reasoning to convince me otherwise, but it will take some stronger convincing since the three that I am thinking of are friends.
I have talked about the exact thing we are discussing as far as having knives for sale on their table. (Years ago, I have even pushed them to do so before the show.) I have asked them why they go to the trouble and expense to come. I understand now -
It is due to their passion and friends. Let's not take that away from them, because we are upset that we could not get one of their knives at a show and are not satisified to place an order and wait for one of there knives or buy it on the secondary market.
Folks I understand the feeling of not getting a knife that you want and are ready to purchase first hand. I experience it multiple times at every show I have attended. It is a part of collecting knives. A key is to order it, enjoy the wait. You can relish the wait and the knife when it finally is finished. I went to Blade this year with the goals of picking up a Brend from Walter (none for sale at any time except order deliveries), a knife from Richard Rogers, and the A.B.S. auction dagger.
I came home with a knife from Richard, a fancyied up Model 4 from Kit, a Tai Goo bowie (see Keiths current avatar), a Burger Sword cane (spinal arthritis can be a royal pain

), a Hugh Bartrug piece, and a Lochsa. Placed an order with Walter (and it does not really matter when it is ready.)
So in total I hit 33% of my goals for the show and it could not have been a better one for me. (Unless I had the chance to meet more people and spend more time with those I know.)
With 100% honesty I can say I would go anywhere in the mainland to attend it even if there were no knives for sale at Blade. Knives aside there are way too many friends gathered in one place to miss it. It would be a great time to get together and gawk not to mention coming home with a bank account un-affected for the most part. Having that attitude makes the collecting that much better (at least for me).
I have seen makers that bring knives that are commissioned and that they are in the middle of making. (Actually saw one very ornate knife displayed during its creation over two Blade Shows and the finished knife at the thrid.) Let's not send a message that he is doing a diservice to himself, fellow makers and collectors by doing so (long run or short run). I just don't see it at this point.