Well, i'm not done building all of my suits yet but what I have to try to do is take each character class and build a suit that is very good but not maxed out in the way of resources but 500 weight.
So, rather than using high cost resources I use the lowest cost possible, so, mainly i'm using gems. This seems to make more sense if you imbue all of the pieces so it keeps the cost low. When you begin to mix artifacts in and in some cases, it seems necessary. For example: Lower mana cost. Then it would make sense to sell pieces rather than whole suits explaining to the customer what arties should be used.
I find in suit building, sometimes more than one arty can be used. For example: The Hat Of The Magi would be used in Wraith Form but The BrightSight Glasses would be used when you changed into a Leech.
Also, as a Weaver, you would change into a Tree or as a Vampire, your resistance is affected.
One of the suits that I have mastered first was The Vampire and that suit was made with Shadow Ingots which were earned killing Shadow Elementals, so there was no cost of ingots. Same with the weapons and shields, ring and bracelet, plus then no powder is used, so the cost comes down again. Then i'm not capping out any of the MODs, so i'm not using ingredients, another huge savings in time and cost. Then the suit is tested, if the Sampire can live then the suit is passed, if the Sampire dies then the suit is adjusted. The desktop also plays an important role as well as skills because the suits are designed for that character.
Another thing though, that can be done, is to add artifacts to the suit. So, by removing the neck piece, you can replace it with an artifact and not break the suits integrity. So, you basically end up with 2 versions of every suit and you can sell a complete suit for around 100,000 GP and still make a big profit as far as the GM made material.
The problem is, is that if you're going to stock the vendor, for example: Say I put 5 suits or I put 10 suits, who is going to buy them? Now, the ones that I put on there sold the next day and all of the prototypes and pieces sold. Without a buyer the sets are going to sit for years. So, I really don't produce them yet. Without a guaranteed buyer there's no point on just making suits and selling them. The vending system needs to purchase the items.