I must admit I did buy a new Porsche a few years ago. A cheaper model, though.
The parts to make decent planars aren't that expensive, although a set of neo magnets for Duettas comes in at about £4K last time I checked it a few years ago. What costs is the skill, time and need to make a profit etc etc.
I am in the UK. I did think about taking them to a show but didn't in the end. I have had a lot of people round to hear them, though not since Covid.
Here's a video I posted a while back on this forum. It won't tell you much apart from the fact they work, but when you're in the room this does sound pretty ace. Speed, clarity, detail etc all top notch.