<prompt> Human: For example why dont regular people invest 1000 in the same proportion of stocks as warren buffets portfolio or some other successful investor?  <response>: Two reasons.The first and primary one is that past performance doesnt necessarily predict future gains. If you copy a great investors portfolio and it tanks because you didnt know what you were doing, bye bye money. The other reason is because you would have to constantly keep up with their trends, especially if youre trying to mimic a day trader. Thats assuming of course that they even publish their portfolio in the first place, let alone on a consistent basis. I much prefer tracking an easier benchmark to follow, such as a Target Date fund tagged with the year youd like to retire. Simply copy the numbers using a basic 3 fund portfolio of US Total Stock Market, International Index, and Bonds. Bada bing bada boom. 