What do you guys and gals think about the Forest Service providing some kind of Monthly Camping Discount Card - pay for the card ahead of time and get 30 days of camping for a discounted price. It would be similar to the monthly card you get from a communter railroad.
Example - Assume that the typical daily fee for a FS campground is $20. If you buy the monthly pass, the equivalent daily fee is $15. Another benefit is that you would not have to put cash in the envelope (how often do we have exact change? )

All you would have to enter is your card number and expiration date.
Would you like this option? How would you make it even better?