We have one membership shared between my wife and I.
This immediately cuts the bill in half. We only renew if they offer a deal, which means we usually only have it for about 10 months a year. Whoever gets a deal in the mail to renew gets the membership in their name. This often means we alternate between cardholders.
CAA covers the cardholder, not the vehicle, so if I lock myself out or the car won't start, I call Momma for the card number, and for her to come to me. She then comes using whatever mode is available, and is on hand when the towtruck arrives. Having older cars, we feel like the coverage is worthwhile but since all our long distance trips are done as a family, we don't both need coverage.
We really only ever use their lockout and tow service. I can change a flat faster than they can get to us, and for a boost, I can flag someone down before they can reach us. The service is notoriously slow, especially on bad weather days.
Last time Momma traveled any real distance without me, she got a flat on the laneway to her family's cottage, a good 500m off the road. I was impressed that she was able to change out the tire in the mud with no assistance and no cell reception. Apparently the owners manual had all the steps laid out for her and with a little common sense she managed fine. CAA would have been no use since she was too far off the road, and the van wouldn't move (stuck in mud at teh bottom of a hill).
Often we will go years without needing the service, but when we do, the years missed are immediately reimbursed by the savings and convenience. FWIW, our annual membership costs about $55.00, and if we do a long haul trip with our pop-up trailer we add on RV coverage, prorated to the end of the year, which added $20.00 last year.
Things of note if you aren't a "car person" check that your car has a spare tire, that its inflated, and that the jack, lug wrench, etc. are all there. Even if you have CAA, those things should be in your car. Stuff a set of jumper cables into the car someplace. Know how to use them. Be ready to offer hand if you see someone else stranded. Even if all you can offer is the tools for them to do the work, it may be a big difference, and this is a culture that has rapidly been eroded by call services and cell phone 'independence/interdependence".
People who say they don't need CAA have obviously never stood on the side of the highway with a flat spare and no cell reception at 3:00 AM watching the world zoom past while they try to flag down help.