I have to agree with no to slabbing. I collect raw and slabbed but as I was reading Ragman (1974) and a Miller DD 1993 miniseries the other day, I thought this was the part of the hobby I enjoyed most: reading story and appreciating artwork not surrendering to OCD tendicies and fretting over perfect wraps, safe stoatage, etc.
even tho you already read it, entombing it in plastic serves no purposeful function. With it raw, you can continue to enjoy interior artwork, look at old ads, etc.
just my opinion