it's important to inform customers about the resiliency of their systems and let them pick how far they are going to invest for it.

then you get to eat popcorn when stuff explodes.

  * single server event.   $
  * multi server event.    $$
  * single az event.       $$$
  * multi az event.        $$$$
  * global provider event. $$$$$
  * cross provider event.  $$$$$$
  * alien invasion.        $$$$$$$$$$$$$$