Corey- the cards you have are incredibly rare and aren't as condition sensitive as others may be. It doesn't matter if the Just So Cy Young has a crease or a mark or whatever if it's unique and thus the finest known.
If I were still collecting I would prefer to leave my cards raw. I can grade just as well as any TPG; and while in the past I would often say I need the expertise of the graders to detect alterations that are not readily visible, we've come to recognize that that expertise is not there.
But as you said, when it's time to sell, you must slab 'em. That's the power that TPG's have over the marketplace. You can't transact without them.
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