The PorcFest tickets are for attending PorcFest events (the speakers, forums, shows, etc.)
Accommodations (tent site, RV site, cabin, motel, etc.) are separate.
You can camp without paying for or attending PF events. You can attend PF events without staying at Roger's.
Since I have zero interest in the events, and I live 2.5 miles from the campground, I'm happy to pay Roger's the $5 guest pass for the day and just wander around seeing old friends and doing business with the vendors.