There is just nothing out there, open source or otherwise, that even comes close to GPT-4. Therefore, the value proposition is clear, this is providing you with access to the SOTA, 2x faster, without restrictions. I can actually see this saving a lot of time for employees (1-10% maybe?), so the price is most likely calculated on that and a few other factors. I think most big orgs will eat it like cake.
That depends on the task. There are plenty of LLM that will run locally that will do things like write emails, write a summary of some text.