About the same... Over 10 years the S&P is up 83.6% excluding dividends. Going back to July so month to month comparisons are valid it looks like the annualized return is 6% excluding dividends and 8% including them.
Agreed. With a lot of risk for that reward. The risk shows in the volatility (ups & downs) over that time, and that the gov't had to borrow several $trillion to prevent a negative return over that time.
http://dqydj.net/sp-500-return-calculator/