I actually kind of was answering your question -- I don't have a pair myself, but others have been jettisoning whole systems, but keeping the JH13. So I suspect the answer is, 'yes, they do scale well, and one would think, fairly high'. Based on zero experience, for the record.
I see no problem centering a system around them, just because they're IEM's. They're very well designed IEM's, from everything I've gathered.