I can't even imagine wanting to handle managing accounts and credentials for that many users at an enterprise! At that point SSO integration is well worth the money. How did you handle removing access when a user was no longer employed at the company?
Not OP, but also building a similar user system. I can totally understand the motivation to not use the internal SSO. With most companies I know, as soon as you actually connect to their private datasources, you have to do some extra steps to prove how you're securing your platform. This makes sense from the companies perspective, but also introduces a huge technical and organizational overhead for the startup which might be better spend elsewhere if your product does not absolutely rely on SSO
