Except for the other person who complained in the responses about uptime.
Or the tweets from people reporting that their site is down, and your site is down: https://twitter.com/#!/search/%40wpengine%20down
"And "terrifying"... really?"
When you get hit with a heavy load and go down, it is an huge issue for a web business. The whole point is to drive large amounts of traffic, and so if a marketing campaign is successful you're paying for nothing.
Apparently you don't think that web based businesses having downtime is an issue. Worse yet, your casual and downright confrontational attitude when confronted with actual evidence.
So, yes, WPEngine...terrifying.