Anybody that has ever had a few traffic tickets knows that is a bull crap law. If you are "popping a wheelie" you are already breaking about 3 seperate laws that they can bust you for, none of which are cheap.
1) wreckless driving - anytime your driving dangerously and I think this includes wheelies. Probably about $250 ish in most places and points on your driving record. You can tack on a little more if there is traffice in the vicinity.
2) loss of controle of a motor vehicle - If a cop sees you spinning your tires in a car or sliding through a curve or sliding to a stop you can get this nifty little fine. Im sure it works just as well if your on 1 wheel and your vehicle is equiped with 2. Normally around $150 ish in most places and point on your driving record. Again you can tack on a little more if there is traffic in the vicinity.
3) Speeding. Im sure you can pull a wheelie without speeding but at the same time if your on one wheel it may be hard to dispute anything the officer at the scene can come up with. $20 per MPH over the limit. 5MPH over usually cost about $100
So I can easily see where as most laws stand you can get a $500 ticket for a simple little wheelie. Already alot of guys I know will just run it out if they get a good shot at it. If the fine where $1000 hell I would have to take my chances with a fleeing as well.
In my opinion, if you pop a wheelie and no one gets hurt, no blood no foul. If on the other hand you hurt someone, well then its time to pay the piper. But stipid rules dont a better society make.