Earlier quoted context omitted.
You have some good points, especially about scaling the international stuff, something I hadn't thought of. That does sound compelling but B? I don't see why I want to bundle my stocks with my television series. And, I'm not sure Amazon has security that is any better than Vanguard.
I don't think Vanguard's security is better than Amazon's [1]... Technically they could be more secure than Amazon despite running stuff on AWS, but still, I'd say Amazon's track record on security is pretty good - and pretty much the entire Enterprise world relies on it. [1] E.g. they obviously run stuff on AWS: http://www.vanguardjobs.com/job/7980466/ts03-cloud-architect...
I find that... terrifying