The price went up in 2017. That was the first increase since 1994. I think that it is still a good deal. As for restricting discounts on weekends, I agree with it. My wife and I donate to the parks that we stay at to bring our camping cost up to what a young family would pay. We can afford it more now than when our kids were young.
Just because you are a senior citizen does not mean that you are not taking up a camping spot. After all, the parks cost just as much to operate when full of half price customers.