I have a different opinion on this .....
I say do whatever makes you happy and increases your enjoyment of the hobby.

Consider the cost ..... but the bottom line IMHO is that all of us collect for the joy of finding/owning treasures .....
Sooooo ... if it makes you happy to have your treasures slabbed then I so go for it ..... the cost versus market value of the coins is not the issue .... your personal need for what makes you happy is the question.
Only you can make that decision.
Best
David
Take a look at my other hobby ...
http://www.jk-dk.art