I used to drive a p o s, and, I locked my keys in a few times...
In my early 20's when I would drink too much at a bar far from home, I would pull off the coil wire and call for a tow, way cheaper than a DUI.
Everyone who drives should have some kind of roadside assistance. You aren't always near friends and/or family.
We had AAA, but then it got really expensive and we ditched it. I work with a rental car company, so if for whatever reason my car doesn't start after work, I can just take a different car home. The AAA service would never work out for us in the long run. If we needed a tow truck, we would just bit the bullet and take care of it ourselves. It's not like we need a tow every few weeks/months.
My car only drives to and from work and some small errands. Same with my husband's car. If something happened on my way to/from work, then yes, that would suck, but AAA is still a waste for us. I know it comes in handy for others who use the service (and discounts associated with it) a lot more than we would.