I think a huge part of the issue with having Grzegrz reshell the IEMs is for people not within Europe. It's simply not feasible. Also the asking price for reshells is still rather steep. These things will always serve as an obstacle. I bet you that is impacting his overall bottom line in a huge way. It limits his market.
Did you get to try the FX850s out? I really like them. And being they are around $270 that is a good deal IMO for what you get. How they image in game is pretty uncanny also. Feels like I'm not wearing anything.