The big companies are paying for on-demand access as insurance. They aren't stupid. They fully understand they're paying $2K+ per month and only using service for an hour or two each month.

What becomes challenging at those rates and client densities is managing a tail risk of a collision of multiple big clients suddenly wanting services at the same time. You're just playing chicken with that happening, until you can scale your offerings and revenue up to where you can reduce client density to where you can handle the crunch better when it happens.