Whisky can be a high yield asset for investors wary of volatile equities market, he said at the launch of his World Whisky Index, a website that aims to bring buyers and sellers of rare and expensive whisky together.
"If you invest in stocks, there is always the risk the value will go down. With whisky, we do not see that," he said.
"It is a very stable investment. The annual rate of return is 12 percent," said Kappen. He cited the example of a bottle of Black Bowmore Scotch malt whisky, distilled in 1964 and bottled in 1995.
"From 150 euros (R1, 460) in 1995, this bottle is now worth 2,450 euros (R14, 742)," he said.
The World Whisky Index currently has 2,853 bottles of whisky on its list, with the most expensive priced at 650 euros and the oldest dated 1926.
Still, a drink is a drink and a personalised bottle of rare whisky could boost one's career, said Kappen.
"You can look in the Index for a whisky distilled or bottled in the year that your director was born and give it to him," he said.