I had a Porsche briefly (electric conversion that turned out to be complete a disaster) and got stopped the first or second day I drove it on the streets here in Spokane. The cop gave me a warning and told me he'd be keeping an eye out for me.
Some folks think that they're above the law. There's a reason that both plates are required, even if some states choose not to have that requirement. My philosophy is either obey the law, or break it openly in protest and take the consequences, not try to get away with it because "My car is so pretty I shouldn't have to put a license plate on it."
Just my opinion.