Would you buy something that you cannot see, touch or feel?
For instance, if you wanted to buy a new mobile phone today, and you walked into the mobile shop and after describing your needs the salesman told you, “Oh we have just got the solution for you! This phone solves all your problems and have the latest features and technology. However we do not have the sample for you to see, so you will have to make payment first before we give you the actual phone.”
Would you still buy the phone?