This is something that has always puzzled me, i.e., people who have but one set of keys. I never have fewer than two keys to my car, often three.
Not doing this helps ensure that one day you'll lock yourself out of your car.
Exactly, however, I have an AMA-Alberta Motor Association membership. (AAA in the US, I believe?) I got it for my wife and, as she’s gone, I renew it for me in case I ever need a tow. They will also come out and unlock your car for free, as a member, but I keep a second key, just for winter starting.
Not to get too far off thread topic but Volkswagens make it virtually impossible to lock your keys in the car. You can’t lock the doors manually while the drivers’ side door is open and, IIRC, while inside you can’t even use the remote fob to lock the doors. (I don’t have one anymore)
With all that said, I’m a bit confused: how would keeping even 50 sets of keys in the car prevent being locked out of it? If you accidentally lock the car all the spare keys are locked inside too; or am I missing something?