You top out at 20 tokens per second on hardware with memory bandwidth this low for any local model actually worth using. Doing the maths, it’s not financially worth it. Only worth it for privacy and control reasons.
I don’t understand your calculation, can you elaborate? At 25USD/Mtk output, assuming your 20tk/s, I generated/saved (minus power costs) ~15k$ in a year.
Granted, it won’t run 24/7, but over a couple of years, this is definitely cheaper.