My family investment portfolios of stocks,bonds and funds in pte banks is worth around $6mil at this time (hopefully, the market don't turn worse..if not, it might be less. :P) ... This sum excludes the budget I've set aside for direct property investments that I intent to do when the property market turns. I'm currently the manager of the investments and i'm only 34.

For whizzard to accumulate $10mil before 40, he might have gotten it from inheritance or he could be a high risk taker (example, flips properties aggressively and was not caught with his pants down). He might not be the typical sticking it into a portfolio approach to investing, and contented to the 8~10% compounded annual return type.

However, for the rest, I think it's well worth considering portfolio approach to investing as it is better to be slow and steady than be burnt in a blaze of glory.