Why are some people like this?

[RichardSimon]

Sometimes you just shake your head.
A customer, not sure if he is a member here, L. T. Smith, orders a Roger Maris AP from my price list for $325. In the list it is described as beautiful signature with light fold in the page.
He pays me, I ship.
An hour later he e mails me and says he did not read the ad fully, did not see the part about the fold, and did I ship it already? He also says he gets his stuff graded and wants a 9 from the great and all knowing god of PSA.
Yes I shipped it I write back to him but look at it and if you are not happy then return it.
He gets it and says yes it is nice and it is just a very light fold but can you give me a $30 refund? Why would I give him a $30 refund. He further BS's me by saying how PSA is tough on grading. What does that have to do with me?
This is BS and I refuse to give him a refund.
He then says he is returning the Maris.
It appears that I have another buyer so I probably still will be selling it.
Sorry for the rant but people like this just leave me with a bad taste in my mouth. Compounded by a $100 offer for a $900 item I have on ebay.
Save me from these people.
I think I need another vacation and I just got back from one.