Weddingbee boards

I am having my wedding reception in the heart of Old City/ Society Hill where most of the park/s land is all owned by the National Park Service. You must apply for a photo permit to take wedding pictures in those areas. Anyone applied for the permit? How strictly are the times/ size enfroced? For 1-10 people the permit is $50 plus a processing fee. I think that's reasonable. To go to 11-30 it is $150. I have a hard time swallowing that price even though that's the permit I need.Do I just wing it? Thanks!