I still use my "knowledge and skills".....
How many times have you had to light a fire to survive the night? Probably never, yet you carry matches? The spot device is similar. You may carry it when soloing for the slight chance of having to use it.
Sending messages to your loved ones is well worth the $100yr. Chump change for keeping the wife happy.
Another benny is the ability to document waypoints as you go, when you get back, you have a map record of where you were... Yeah, yeah, I know you can do this with your GPS...but it is a handy feature.