Count me as one who has no problem slabbing programs. I don't collect them really, but did land this one, slabbed as NM by GAI (pardon the poor cropping--the entire holder would not fit the scanner)
I once won a '65 World Series program (LA) on ebay that looked and was advertised nm-mt. When it arrived, it was absolutely pristine. No way it was ever fully read, maybe hardly/not at all. As geeky as this might sound, I didn't enjoy it because I didn't want to put any kind of stress on the binding or inadvertent crimp on the cover or a page. Bottom line, it remains in a plastic sheet, and would be slabbed if I could find a decent service. I will buy a beater if I want to read that program-- in this case, at least, it is simply not scarce.
I believe that there is nothing wrong with trying to preserve an older item, especially one that is in unusually strong condition. I know that seems antithetical to enjoying the item, and it is, but I have no problem understanding a collector's motivation in having it slabbed.