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runscottCheck out slabbed and un-slabbed sales history on ebay for the issues and grades you are considering sending in (to SGC of course). Purchasing trends can change almost from month to month, especially with t206s and t205s.
But also keep in mind that in some cases the slab might actually hurt a card's re-sell value because the slabbed grade follows, for the most part, strict technical guidelines that don't usually have much to do with visual appeal.
For instance, an SGC40 card can have perfect color, registration and corners, but gets the 'vg' tag because of two creases that don't even break the paper. Or an otherwise Near Mint card that has a faint 1/2" surface wrinkle on the back that only shows up when holding it at an angle under lighting...gets SGC50. These two examples are clearly going to do better without the slab.
But on the other hand, an un-slabbed ugly example that technically slabs "good" might do better in the slab.
Slabs also help when trying to re-sell either extremely high-dollar cards, or cards that are commonly forged, trimmed or that good reprints exist for (Fro joy Ruths, '51 Mantles, '33 Goudey Ruths, any Ruth or Joe Jackson b&w card), simply because they serve to "authenticate" the card...at least that's what people think.