and if you're worried about your credit rating... I was approved for a $360,000 mortgage a few months ago and I've been accumulating tickets since 2005.
Now, if you have morals or a concious. I suggest you continue paying the outrageous costs companies charge per hour for parking. The ordeal you have to go through of switching plates, saving money, ignoring mail/calls and generally just being on top of your game will take some attention. If you slip up, you "may" get towed.