It is costly, especially right now. I don’t think you can make a case for it on cost savings!
The throughput in a single stream is about 50 tokens/sec (a bit less for prose, a bit more for code due to speculative draft acceptance rates) and about 2,000 tokens/sec for prefill. Both numbers are flat and stable as context accumulates. That’s what finally tilted me away from the Mac Studio despite its much superior memory bandwidth.
I think these numbers may improve because the model is pretty new and optimizations aren’t done.
I don't think you can ever make a case for it on cost savings in general. Inference is very obviously the kind of problem where things are cheaper at scale, and this is still true for smaller models.
The only reason to run locally is privacy.