You really should, there's a lot of good info there, including what I'm about to tell you so you don't have to search for it.
At the bottom of the yellow-highlighted box, in the 'fine print', is this disclaimer:
"There is a 7-day approval period from the time you receive your item to request a refund."
Now, I don't know about you, but I sure can't get a comic sent to, graded by, and returned to me by CGC within seven days. As a matter of fact, you'd be hard-pressed to get a book graded and returned before the time limit for placing a Paypal claim runs out, especially these days.
This is what he counts on.
The only way you'll get a book CGC graded within that window is if you have the book graded on-site at a con. How many of his customers do you think actually do that? Not many, and this is why when someone does get a book graded as restored in time for a paypal claim, he's more than happy to refund the money. It's probably less than one percent of his auctions that he gets caught, and has to do a refund. For all the rest, he's laughing all the way to the bank.