But Ling Yu, who runs the business with a Mo, insisted: "We know there is nothing but air in the bottles, and so do our customers." People can put their own problems into them.

Somebody who has a lot of other assets say, you know you're getting a big pension, or you own a business interest that you know you can easily sell might rightly take more risk.

Hotels do not ask business travellers whether they would like to have their own rooms or Shared ones, because they know the answer.