About a year ago I told my wife that the next time she forgets to lock the doors, it is doing to cost us $400.
This is how HA budget was created. I bought a hub, lock and a couple of sensors.
Then, I created an app that would send an alert if someone left the home without closing a door. After she got caught a couple of times, she now actually waits for garage door to close before she drives off.
For us, it was more of Spouse Surrender Factor rather than SAF.
Over the past months though, she is really warming up to HA, especially after I made ActiON Dashboard. Before that, she flat out refused to look at ST Mobile app.
Turning lights on arrival is also a big thing, especially in the winter months.