Because every year he said market will crash! One fine year, he will be right!
2015 view: Dr Doom: Gloomy Future for Market; Hold Cash or Short
http://www.sharesinv.com/articles/2015/10/23/dr-doom-gloomy-future-for-market-hold-cash-or-short/?utm_source=si_home&utm_medium=si_desktop
2014 view: 2014 Crash Will Be Worse Than 1987's: Marc Faber
http://www.informationclearinghouse.info/article38225.htm
2013 view: Marc Faber: The Same Sort of 1987 Crash Is Coming in 2013 http://247wallst.com/investing/2013/08/09/marc-faber-the-same-sort-of-1987-crash-is-coming-in-2013/
2012 view: Marc Faber: We Could Experience A 1987-Style Crash This Year