A demo perhaps is all that they need now. Dont' know about money back guarantee. It wont be fair to the company that sells the software. What guarantee would you give them that you wont use their software after their refund?
Actually dutchbb had the answer. Keep in mind the moderators on this site are, well, moderators. Not the ones that make the company policies. Here is a copy of what the link says: 10. Refund Policy
We will maintain a reasonable policy regarding requests for refunds. We reserve the right to refuse a refund or to apply a partial refund. An administration charge may be applied where a refund is offered.