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by AndrewDucker 6393 days ago
The limited user base is the one that would do it for me. 100million people may seem like a lot, but that's less than 7% of internet users (http://www.internetworldstats.com/stats.htm).

I'm fairly sure that I wouldn't want to be turning away 9/10 of the people visiting my site...

You could go with OpenID - or use a third party like RPXNow.