Yeah i was around when Teamon Oak was a PC and Trystan was a player. If i remember rightly, Trystan basically delt in taking orders to craft items, not buying sets to sell from players. The new system will mean that heavy weapons etc will have to be carried before they are sold (obviously because you cant take an order to craft an item becuase theres no telling what the flaws etc will be).
Dealing in light items like scrolls is easy. I've made thousands on Pip by dealing in scrolls and minor light magic items, thats perhaps why the DM's are not changing it, there doesn't seem to be many complaints with wand crafting, scroll scribing (infact scroll crafting has been streamlined alot since i played a while ago; when scrolls of the same inate level had different craft values).
The new crafting system will require a second market traders to carry their goods before they sell them. Does this mean that any merchant group will need to hire bodyguards to just act as item mules if they dont have storage space? I suppose we have to be inventive as players and the best merchants are, but theres only so much you can carry as a player before it starts to get boring and you just resent the path you have chosen.