My votes....
My #1 vote would be fake autographs/memorabilia. You are paying for something that is absolutely worthless and don't know it. It's also the most prevelant problem in the hobby today.
After that, my #2 is altered cards only because they have slightly more value than something that is totally fake and again you most likely don't know that its been altered.
#3 is mis-grading because it contributes a lot to the previous two issues.
#4 is shill bidding. Typically, the victim probably pays 10% to 30% more than he should of.
#5 - being stiffed on your consignment is bad, but in the big picture it is a drop in the bucket compared to the other fraud in the hobby and at least you know you've been victimized.
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