Definitely worth the cost for the $80 pass! Before I got my volunteer pass, I definitely saved at least $150 on fees, now it's even more! Not even a question whether or not to get the Senior Pass if you qualify. Also, for the first time in years, entrance fees will be increasing in many of our National Parks, but pass prices are staying the same I believe, so even more worth it!
No doubt one of the best buys out there. I'd been an annual pass holder for many years, back when it was $50 I believe. But, when it went to $80 it was still a bargain as I visit a local NP almost weekly these days.
And, when I finally did hit 62 the $10 life time pass was a true no brainer.....
I bought mine this past summer in the Smokies which ironicaly doesn't charge an entrance fee but used it several times while at Glacier NP in Sept. It's a great deal, get one if you can.