I was going to stay out of this topic because recently I've been dealing with actual real life honest and for true professional designers rather that the usual bored individual who pays $20 for a resale number so she can redecorate her house without paying retail for anything. BUT...
(c'mon, you knew that was coming)
Today a designer came in to borrow samples she had taken to a client's home yesterday. "To be honest," she said "I'm going to have Beverly (the Framer 3 doors down) make the frames. I just want to run these down there so she can see the colors."
Hey, Beverly can make all the frames she wants. This town IS big enough for both of us, along with the 2 other frame shops I can see from my front door. However, there is a difference between friendly competition and being a complete doormat.
So, today's answer to your question Curly is that they will all be escorted to the nearest door and warned not to let it hit their keesters as they leave!!!!!!!!!!!!!!!!!
If I had my own shop here's what the policy would be: A set percentage discount only to designers who provide valid resale information AND 3 trade references. The discount would be determined by the volume of sales brought in by that designer. Everybody starts the same, but discount increases as volume increases.
Many of my favorite industry educators say no discounts to anyone ever, but the real design trade is so used to getting a discount that I am certain if I said "None" when asked what discount I give I would lose that business.