I don't know. I agree with Google on this one. There should be more people paying for this awesome service.
And to be honest, 50 accounts is still a lot. Having 50 or so employees in a company is a fairly large company, companies with that many people can fork up $50/user/year
The only reason Google's competitors have not been charging for these kind of services is because Google hasn't been. I imagine many competitors want Google to make this move as then it allows then to do the same and start building some much needed revenue.
And to be honest, 50 accounts is still a lot. Having 50 or so employees in a company is a fairly large company, companies with that many people can fork up $50/user/year