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hankronNinety nine percent of the fakes is that stupid stuff you see on eBay: "I'm no expert. Selling as unauthenticated and ungraded. No refund." I assume most of this stuff sells under $50, though that's just a guess. If real, most of this stuff woudn't be graded as they are handcut or have other serious techincal problems.
If you're talking about more advanced stuff-- rebacked T206 Cy Youngs, altered T206 Magies-- those things are much rarer. If sold, some of these would likely sell more than $500. If real, some of these would be graded 1-10.
I'm aware of a few serious high end forgeries of previously unknown items (e.g. the forger made them up). These are usually expensive (many to most >$500), but are rare. Again, these are not counterfeit T206 Cobbs or Goudey Ruths, but 'new discoveries' you would have never seen before. If real, some might be graded (e.g. given a grade 1-10, as opposed to 'authentic') but many would not be graded as they are handcut or whatever..
Most fakes sell under $50 and, even if real, would be not be graded 1-10 by reputable graders.