If there's one thing that I got from RDPD that was a wake up call it was this.
The poor earn money, pay tax and spend what's left, whilst the rich earn money, spend as much as possible on legitimate expences and pay tax on what's left.
Just the application of that one principal can mean the difference between financial freedom or financial hardship.
Tony Melvin and Ed Chan have a great example at the front of their "How to legally reduce your tax" book which says that if you have $2 and compound it at 100% over 20 years you will end up with $1,000,000. If, however you tax the gains at 48.5% each year before reinvestment, at the end of the same 20 years you will have just over $5,300.
I would also imagine that those who pick holes in the writings of Robert Kyosaki would be in much the same financial position that they were 5 years ago.