I think the 10-15% graded may be about right for prewar. I've only graded a few, and that's about the range for my collection. The majority of it is probably not worth grading. There's maybe 10-20 cards I should grade, and maybe about double that that I think I'll eventually grade. I've been very down on all grading companies lately, so it may be a while before that happens.
The stuff in better condition or with higher value will naturally be higher, although there are still plenty of nice cards out there. Maybe a third of the T206s I graded were bought with grading in mind.
When I was looking at Population reports as flawed as they are, one thing that I noticed was that At least for T206, HOFers and the less common varieties were slabbed about twice as often as the commons. For a handful of cards where I could tell, they were probably slabbed far more often. For example there were more Magies than Magees.
Steve B
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