There's only one reason why someone would ever park like this - they want attention. They obviously have an expensive car, so they presumably just wanted to make sure everybody noticed it by parking it in the most selfish, ignorant way possible. There's no way this was done by accident. They've parked perfectly right across the center of the line.
It's likely that this was done because the driver of the expensive car didn't want it scratched by someone parking next to them, but if everyone took that attitude, car park capacity would be halved everywhere. Your expensive car doesn't negate the right of the person next to you to park their own vehicle. If it really means that much to you, maybe wrap your car in bubble wrap to eliminate the risk. That way, you won't end up as the star of a passive-aggressive poster.