I had my '06 Beck Speedster for almost 12 years and put 56k miles on it. While not a Cadillac and not weather proof, they can be driven anywhere. @MusbJim put over 100k miles on his first one before someone totaled it. Not sure what he has on the second one, but I know it's an almost daily driver for him.
Some people buy them thinking they'll be fun like a Miata but with more classic charm. What they find out is that our sports car forebears were made of hardier stuff and didn't require all the modern conveniences, nor did they mind having to do periodic tinkering to keep the cars running well. Others buy them on a whim, captivated by the look and imagined experience, but find that the car doesn't provide what they imagined, or doesn't fit their life situation. Those are usually the drivers who sell their cars with few miles on them.