Ladies and Gents. Do understand the technology you are placing in your homes. Purchasing is turned on by default.
https://youtu.be/oI2KLIULjXc
Honestly, after the Snowden revelations, why anyone would want a live mic in their home 24/7 is beyond me.
It's a good shout, adding a pin code to purchasing is fast, simple and removes any issue around accidental purchases.
As for having a mic in your home 24/7 the same Snowden revolutions showed us that if you have a mobile phone 'they' can turn on the mic and force your phone to pretend that it's off. Amazon's already shown they're willing to fight requests to the data Alexa collects so I guess, ultimately, if you're concerned about Alexa you should definitely be concerned about your mobile phone too as most people have that on them 24/7 [up]