I am getting sick of these threads. The 8% figure your representative quoted you is for long term performance. Your portfolio may be up 25% one year, and down 15% the next year. Over a very long period of time, the stock market has historically returned 10-11% before inflation. Many people believe that expecting these gains to continue from this point onward is only wishful thinking, and say that ~7% before inflation is a more reasonable figure.
On another note, people need to do some basic research and see that the economy has always moved in cycles. People who are just starting to invest in today's environment will likely see several more economic downturns during their lives.