system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do car companies make insanely cool concept cars and then when the cars are released to market, they look like regular old cars?

Why not produce the cool looking car? And if you don't end up producing it, why even create it in the first place?
gpt
Concept cars are usually hand-built. They often don't meet all the regulatory requirements for things like safety features and they may not even have engines if they're only going to be displayed at an indoor show.

The purpose is to build hype for a future model and/or show off some new technology or styling feature. The final production model, if there is one, will usually include a few elements from the concept.