Greg is pretty close to the mark here. There is a cost to building a spectator facility that cannot be justified in the business model for Palmer. It is likely that SCCA Club Racing will be the “highest” form of racing at the Palmer track and the truth is not many people will pay to see that. NER is already on record as saying that guests will be welcome. Sign a waiver and come and watch. Other clubs that rent the track can set their own policy for guests but it will be a lot easier for them than it is now at local tracks as there is pressure not to sign in too many guests because that takes money out of the track’s pockets.
This is not about keeping anyone out it is about having a place to race.
No spectators does not keep you out, it only means you (and the other 12 people who care) do not have to pay.