Have you actually priced it, or are you just guessing?

Are you doing regular patching? Automated restarts? Watching for security breaches? Or just praying it stays up forever?

Otherwise, respectfully, I would not classify you as a "serious operator." Your site could live or die, and it would be all the same to you. Or, you've handed it to a third party for management and they don't offer much in the way of resilience or stability.