It's a multiplayer game after all, not a multialt game.
Limiting or boosting crafting will have the same effect - more alts.
A crafter character should sell crafted items to OTHER players and doing so should give MORE BENEFITS then giving these items to ones combat alt.
Moving items to another character should be banable, but I won't suggest that, players are not ready to play fair (imho using alts== idkfa)