10 year timeframe of S&P index,
Oct 2008 to Oct 2018, no drip 199%, drip 267% 
Mar 1999 to Mar 2009, no drip -41%, drip -30% 
You actually get negative
Critical to just hold 
(or do DCA purchasing)
Mar 2009 to Mar 2018, no drip 257%, drip 329% 
Mar 1999 to Mar 2018, no drip 111%, drip 200%
Mar 1999 to Oct 2018, no drip 283%, drip 363% 
Mar 1990 to Mar 2009, no drip 124%, drip 232%
Mar 1990 to Oct 2018, no drip 757%, drip 1437%
Mar 2000 to Mar 2012, no drip -3.7%, drip 20% 
I see, bad experience
Oct 1994 to Oct 2018, no drip 525%, drip 876%, 24 years
DRIP unless you need the money for living.