Was looking at the SoundSmith line of moving iron cartridges ( bought the Sotto Voce) but haven't received it yet. Somewhere in my poking around and reading reviews Peter Ledman addressed this. In summary he posits the manufacturers have invested heavily in the tooling and touting of the moving coil superiority marketing, so they'd have to re-tool and eat crow about their marketing.
Peter's take on it, passes the sniff test for me.