You must be lucky. I just moved from Gramercy and kept my bike in a garage in the EV because parking was impossible. I got ticketed 2 out of the 3 times I parked in the street, and in both cases no more than 10-20min after my ticket expired. Ninjas.
There are two tickets they can issue. Failure to display and Expired ticket.
If you have a failure to display, you will automatically win the case if you plead not guilty and just say i have a motorcycle (have done this 3 times and won all 3 times).
if you actually purchase a ticket and it expires, then you admit that you purchased it and let it lapse. Realistically i had no place to put one on my ducati without the wind blowing it away unless i taped it.
of course this doenst work with a car. Cant beat that one ;\