But, sometimes a high amount of spend on a service isn't really much more than the average. For instance, if you spend 200k/mo on a niche service then you'll get a ton of say in how things move forward, but if you spend 200k/mo on EC2 you might not be able to strongarm anything.
I've come from an organization with a $250K monthly AWS spend. It was impossible to talk to anyone without spending an additional $25K/mo for a support contract. Insane.