Loads. They're all on YouTube filmed with Gopros.

Seriously bikes run from cops all the time. They're gone in a flash.

If they have a video with a license plate record of them running away from police, then why don't they revoke the plate and impound the vehicle at the registered address?

I take it you haven't seen the license plate covers popping up all over that basically make it impossible to read a plate from beyond a few feet away?

A representative example off GIS: http://www.v6mustang.com/attachments/dsc00087-jpg.35600/

Why aren't these cars/bikes fined while parked on the street?

I, too, would love to know the answer to that question. I've been seeing them all over in NY, where I understand they're illegal, and have no idea how they're not cop magnets.

Back in the day, I lived on a dirt road, and I never washed my car. So the tag was a little hard to read. But hey, there was nothing obviously intentional about it.