I mean it's also straight-up nh's own gacha-esque system. just without the whole predatory aspect of trying to get people to spend their irl money on, soNMT fit perfectly as a villager currency due to one villager moving out then having an open lot for a new one to move in. Selling the villager for the most NMT possible is obviously the smartest choice possible to maximize the potential for a better villager to move in. Makes perfect sense as a currency to me.
Its almost like it was put in the game for that very reason.
and I highly doubt nintendo thought about people trading hundreds to thousands of these for a single character or making an entire market around
which yeah, failure of foresight on their part