.20 per round for 9mm vs .70 per round .357 Sig. That's a significant difference just for training ammo. No one is using +p or +p+ for training.
357 Sig is a nice SD round, but I can't afford to shoot it.
Reloaded 357 Sig is about 35 cents a round. Still more than reloaded 9mm, but not quite twice the price.
When I despair, I remember that all through history the ways of truth and love have always won. There have been tyrants, and murderers, and for a time they can seem invincible, but in the end they always fall. Think of it--always.