Be aware that there is a Pareto distribution of ALL wealth. 

There is also a Pareto distribution of skills

If you know these two things you can see that aiming for the top is a low probability of success.

Aiming for the middle high of 2 or 3 sets of skills is almost a guaranteed success.   More skills taken to middle high increases chances of success 

And Yes I am using Chance instead of "hard work"   hard work will only increase "Chance"