That's the thing. It's way more "sustainable" and "green" to buy well - buy once.
I'm prepared to bet Tom will not need to repair a single unit other than AC surge/transient event related failures or transport damage- things completely outside his control. The ALPs pots will outlast the buyers, I've got tons of them inside the likes of Sony ES, TOTL Marantz, Pioneer, Accuphase, many of them circa 30 years old. Even the top model CD players use full sized motorized RK-271 for variable line outs/headphones.
I think a mk2 version could include a remocon receiver/driver, motorized RK-271 and a set of line outs for a headphone amp/preamplifier with the same level of performance for perhaps a few hundred dollars more.
Basically, there's lots to love, nothing to fault and the price should be fine for headphone "guys". I really hope Tom sells tons of them.