[drcy]

I think collectors willing to readily buy from sellers they know act unethically and perhaps even break the law don't realize the significance of provenance as it relates to value-- especially over the long term. If it turns out the seller you procured many of your cards is shown to have knowingly sold altered cards, it will effect the resale value of your collection. Whether or not your high grade cards were, buyers will wonder if they were also altered. Many collectors simply won't be willing to touch your high graded cards or their skepticism will at least be reflected in their bidding when they found where you got them.

Many game used collectors have learned the lesson of how the value of LOAs sand items can drop after the sellers are sentenced for forgery and related law breaking, and how it can taint in the minds of buyers legitimate items obtained from the seller. And there's no reason card collectors purchasing from sellers they know act unethically and/or break the law can't learn a similar lesson.