I don't always test my code. But when I do, I test it in production. -The Most Interesting Man in the World

For 90%+ of our customers (small-to-mid sized US financial institutions), production is the only environment available to work with.

For the other 10%, we take them aside and politely explain that they almost certainly have an unusable staging environment per the scope of our B2B project.

Testing in production is a wonderful path if you are comfortable talking to business people and making lots of compromises.