I have not had good experience with this either.
The first one that comes to mind was a simple mat, simple mount, foam board, paper easel (from United that was a stick on) all shrinkwrapped. We agreed to something really cheap like 10 for $50. I kept all supplies on hand and we did 3 or 4 orders of 10 pieces with promises of more to come. I needed to reorder the easels and mat boards, so I did. Six years later, I still have that order of easels sitting around somewhere. He decided to go somewhere else and forgot to mention it to me. It's a good thing I didn't have moulding and glass tied up in that deal.
The next one that comes to mind was an artist that wanted mats. drymounts and shrinkwrapped. I was using PMA for the photography because he didn't like the orange peel and I was the only one he had ever seen that didn't have that problem. We did a fairly large order for him, around 50 pieces. He needed it very quickly, like 2 days, I think it was. There were promises of a lot more of this because he did art shows and if we did a good job, he would be back. There were to be absolutely no overcuts either.
Long story short, he kept asking what we were using for the photography dry mounts and how did we get such perfect mats? He ended up going to the local framing distributor and got all the information from them after he pumped and pumped for information. Apparently, as I tried to avoid giving away my secrets, he got enough information to get the product and do it himself.
The 3rd one was a promise of about 300 pieces over a 2 year period. I gave great prices, great service, went to many meetings and helped promote the project. Eight years later, I think I have done about 30 pieces. The last one is still sitting in my shop from last fall. It has been paid for, but never picked up. The first order was for 10 pieces, after that it was 2 here, 1 there, maybe 3. In helping to promote the project, I even did one for display. They sold that one and it took me 2 years to get paid for it.
I like the idea that I once heard about............3 price lists under the counter, 1 for regular customers, 1 for those who want the big discounts, and 1 for family and friends. The last two were priced high enough to be able to give a discount and still make a profit.