The idea of abrasiveness is an interesting one...
I believe the particle size of synthesized iron oxide pigments is relatively small, smaller than their natural counterparts.
But they could be very HARD particles, do you think?
But how many prints would you have to pull before any abrasiveness associated with wiping affected the plate?
Hmmm, I'm doubtful...
I mean, the most popular print I've done, I've sold 10 copies, not 10,000
Here's another suggestion: There is an article at handprintDOTcom about the nature of various blacks, their aesthetic suitability etc.
So, Vine Black is described as warm, Lamp Black as cool and versatile, etc etc.
Mars Black is described as unsatisfactory in various aspects, hard to manage, not suitable for shadows, and so on.
Maybe it has been judged as having not quite the right look, compared to other blacks?
As a student I experimented with making my own ink, there was a can of plate-oil in our studio that I used as the oil base.
It was "OK", but didn't wipe as well as our commercial ink, and it took time etc, so I didn't perservere with it.
I do like the "artisan", DIY path though, so all the best