Brian,
Keep in mind that what "card doctors" do, may not be illegal, per se. There are no laws against, trimming, re-coloring, crease removal, etc.
They only break the law when they attempt to defraud someone. Many avoid this by not becoming card sellers. They just perform a service, for a fee, for other people. Unless they are aware that their customer is engaged in a fraud (buying, repairing, and reselling), it's hard to pin any crime on them.
The guy Matt mentioned did both, doctoring and sales, and got in trouble for it.
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