Hey BK,
First, if you are entering into a relationship with a dealer..it is a business relationship. If you are not treating your knife making as a business...don't bother working with a dealer.
If you are slow to build and late to deliver...there is no reason for a dealer to work with you. Why? Because if you can't get your dealer knives...they cannot market you. One knife every 6 months really (from a business perspective) just isn't worth the effort.
Generally if you are a new knife maker you can expect to give a 30% discount...for 1 knife...not 10.
Established makers generally the discount is 25%.
Are there exceptions..yes there are. Ed for example has a different dealer discount program. It works for him and that is fine.
That is how it was when I started as a 25 years ago. The Makers gave a discount to the dealer...the dealer marked it up...when the makers saw the dealer getting the higher price...the maker raised their price...and so it went. Till eventually (with rare exception) the dealer could no longer get the higher price...and dropped the maker. The maker then had to live with the higher price...maybe they got it...most didn't and faded away or just stopped making knives.
The problem with multiple knives to get the 20% is that the majority of the risk is on the dealers part. Especially if the majority of their sales are internet based. That means credit cards with anywhere from 2.5% to almost 5% (overseas no qualified rate).
You would be amazed at how many makers won't take a credit card from a dealer!

Check please.....or better yet cash. Don't expect cash for a 20% discount!
Ok, so you get a 20% discount and you then raise the price to cover the 5 - 10% you really needed. Now when people do a internet search they find out the dealer is asking 10% over retail. If the maker is in demand and has a long waiting list...not a problem.
However, if you have yet to establish yourself and create a demand for your work. Those Internet surfers will just to to the makers site...and to save the money will buy directly from the maker. This could be a problem....for the dealer.
Now the question is (to the dealer)...what do I get for my 25%?
If you have a web site...and the dealer has a website how many hits do they get on that website compared to your site? If there isn't that much difference...how much of a discount is that worth?
Do they SET UP at shows...not merely attend? Setting up at shows allows collectors that you may never come in contact with to actually handle your work. How much time does and expense does that save you?
Just as a maker has a position in their market so does a dealer. Example...no one is coming to me to look for a Loveless knife...I don't carry them. So if you are selling High Dollar Art knives...maybe someone who is best known for hunters is not the dealer you should be working with...and visa verse.
Another aspect that few makers consider (and if they do few talk about) are the business and marketing insights that a dealer can help you with. Pricing is a perfect example. I see on this forum and others that makers have a difficult time pricing their knives.
I have always wondered why makers can't price their own knives. The main reason is...they don't know the market that they are in....and most don't want to take the time and effort to determine where they are in that market (and believe me it takes some time). Then again I can value price any knife in a particular market. That is to say...a price on the knife that will get it sold and offer your client a little room in the price should they want to resell the knife.
Yes...I am one of those who thinks custom knives should hold their value...and should in most cases go up in value. Check out the current issue of Knives Illustrated for my article.
Ok, so we have:
Website/photograph
Set up at shows (not merely attend)
Dealers position in a particular market
Marketing/Business advice
Lastly, the dealers ability to get you and your work into a magazine! How much is that worth? It is worth Thousands of Dollars...check out the cost of a two page, 4 color ad in one of the knife magazines when you get a chance!
Remember working with a dealer is a business relationship...if it doesn't not benefit both of you there is no reason to have it.