The important thing here isn't that a company implemented guest checkout. It's that when they did it, because we could see the problem in our research, they found $300m in revenue. Guest checkout won't work for everyone, but doing research like this likely will.
I wrote a post in 2011, talking about the back story a bit: https://www.uie.com/brainsparks/2011/10/17/the-back-story-fo...
And this is a more recent presentation on using metrics in design. I talk about the $300m button starting at 44m:45s - https://www.uie.com/jared-live/#design-opposed
The important thing here isn't that a company implemented guest checkout. It's that when they did it, because we could see the problem in our research, they found $300m in revenue. Guest checkout won't work for everyone, but doing research like this likely will.
- Jared