I understand what you are saying but here is the difference in my opinion
Scenario 1. "I guarantee this item to be authentic". It fails, you go to get your money back and you have to get into the whole "Woo are they to say my autograph is not real etc." and then you have to get into the whole "I say its real, they say its not, you cant prove anything" situation of he said she said.
Scenario 2. "I Guarantee this item to be authentic and to pass any third party grader you choose, PSA, JSA whatever". It fails, refund end of story!
I think that is why you put that in an auction description, peace of mind knowing that you will stand behind the item based on the opinion of another person. It is the same guarantee (at least from well respected dealers) but some people might be left arguing over the grey area in Scenario 1.
Rhys
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