Near the end of the article: These kinds of incidents make us wonder the real cost of Code and the more real cost of messing up

Imagine having an app about there ticking away and making pretty decent revenue. Little do you know there's a subtle error in business critical code (e.g. in-app purchases, ads, etc), reducing the revenue by over 50%. This is something I've seen first-hand and have become quite paranoid about. I suspect that it happens a lot. The reality is, no matter how many times one looks at their own code, there is no substitute for continuous testing of typical use cases in a production environment, ensuring that business critical code functions as expected. It's a continious process, because even if the code works properly at the beginng and isn't modified, the underlying OS or API's it interacts with can change and introduce unexpected behaviour.