I don't really follow how this would make the price of custom enclosure's go up? If the box is as good as I claim it might be than all it will do is make the custom builder's step their game up. I've been very successful as a custom builder so far and my prices are pretty high already.
And I'm not sure why you think I'm being so negative, I'm simply telling you, you might not know as much as you think you do.
If you have been in the "custom" world long enough you know there is no single magic enclosure. That will always keep "custom" the best option for the $$. As for being negative, it is how you are coming across. It's not my fault you don't like what you hear man. I see no reason to sugar coat anything here.
The value of custom enclosure would increase with any prefab that would push the price up. The reason is because again there is such thing as a magic enclosure. No matter what a custom enclosure will out perform a "prefab". I'm sorry but that is simply true. This means if you get the prefab market price range up we call can freely increase our pricing with no issues what so ever. There would not be a reason to worry about the quality of custom enclosure being better as, "if" the builder up to par, it will be already.
I have seen some very good prefabs roll around over the years. None of them stick around because the prefab market is very very hard to work with do to the low margin of profit and high over head cost. In short, you have to order from over seas or you will need a CNC or two to cut 8 hours a day 5 days a week to keep up. A good CNC is not cheap nor would a location be if you don't have on already.
The best advice I can honestly give you, is...
1. Stick with local clients(shops) and try to slowly build a dealer network that way gaining some respect if you can. This goes a long way in this industry.
2. Send out several enclosures free of charge to key people with in the distributor network. This could get your foot in the door for large quantity ordering if they feel your product will promote itself enough to carry.
3. Do not over look anyone that has an opinion while you are still in the planning phase, even if you don't want to hear it. This will get you much further in this industry then just about anything else. This is a very very small industry where we all know each other very well. I don't mean the enclosure industry, I mean 12volt as a whole.
As I said, I would love to see you make it and do very well for yourself. It would work great for you and custom builders alike.