I sell digital goods - domains and I cannot tell you the amount of times I get scammed from domain buyers.
They purchase several domains (terrible ones too) and then they say the transaction was not authorized and win the dispute.
I lost nearly $1,000 in domains this year because of this and then I finally consulted with people on how to get this to stop.
Edit: Just want to let you guys know that those domain buyers do not have the domains since I took them away, they didn't pay for them so why should they own the domain.