Although I respect your perspective, I think diversification is still important because despite being an expert in any one niche, markets work in cycles as we have seen this year that could hinder your ability to earn if too invested in your area of expertise. For example, I have countless stories of executives that made a great salary and also had a lot of stock in their company. These were experts but relied on one source of income and when the Company went under or experienced challenges; they could lose it all, salary and savings. I think it is important to be diversified but be careful to not overdiversify which could dilute the results of your knowledge.