If you actually read my posts you'd see that I have already provided a solution that would greatly lesson the problem of RMT: make the best gear require a crafted component and a non-tradable component that drops from endgame content. A system that SE used in FFXI.

Another thing that would greatly lesson the RMT problem would be to have the materials for the crafting component be easily accessible (tomestone items).

Yet SE chooses to not use any of these solutions.

Which is why I think it's more likely that the biggest reason to not make craftable gear comparable with endgame dungeon drops is because Yoshi-P wants the endgame players to be able to completely ignore the market.