Don't Diversifiy, Concentrate into high perofrmance investment

Many people said diversify is the key to succeed in investing world. I do not completely agree with it. Especially, when you're young, you should consider take more risk since time is on your side. I'd rather concentrate my capital and energy into some higher risk AND potentially higher reward investment. For example, let's say you have a set amount of capital (say 30,000) to invest in Mutual Fund. It's normal for most people to invest 5 or 6 Fund to diversify. But I believe the more effective way to build wealth in a shorter period of time is to concentrate into high performing Fund. I'd do the research and analyze which fund will have a higher chance to increase in value. After I'm confident on my research, I'd concentrate all my seed money in it. I 'd buy no more than 3 Fund and watch how good or bad my picks are. I will go back and learn the mistake I make from the research and analyze if my fund go down in value. So, next round I can be more informed and make a better selection. So, diversify is the easy and lazy route. You could reach your goal when you're 65 or 70. But if you want to build wealth tonight, we should learn and train ourselves to select right investment with the right market to maximize our return.