I would like to start selling services on my website, and would like to accept payments with paypal. But as I read more about Paypal refunds, I worry more. How big customer chances would be to get a refund, if he gets a service, but decides that it doesn't satisfy him, even tough I give him what he bought? For example I sell 1000 clicks for his website, but he waits two weeks and sees that he only got 500 of them. If I write in terms of service that I do not guarantee that user gets all clicks in some period of time, would that help me to win?