I'll attempt to give a serious response, though I know these companies pour millions upon millions of dollars into coming up with flashy but ultimately empty counterarguments to some of what I will say.
First off, let me say that I consider neither Donald Trump nor Robert Kiyosaki to be particularly praiseworthy businesspeople. Both are savvy in their way but both are plagued with controversy and trade more on their name than on any special business acumen. These are not people you should aspire to emulate, unless the sole goal is to make fistfuls of money. They both have a history of ethical breaches, shady dealings, and failing spectacularly. Both trade on former success and I will bet a shiny nickel that the article you linked, clearly from a MLM publication, was generated after both were cut a nice fat check for the use of their names.
Secondly, the problem I have with most of the modern forms of these companies is that they rely on people to mine their relations and close friends and capitalize on personal relationships to pressure friends into sales and, even worse, into becoming salespeople themselves. Most sell products of questionable value. You have either:
* Trinkets (jewelry, clothing, etc.) of low quality and high price.
* "Medicalish" products which operate in a gray area where their claims are limited enough that they can claim "FDA approval" or "CE Mark" because they carefully avoid concrete promises and rely on subjective evaluation of results (The classic "frowny/bad lighting" before pic and the "smiling/makeup/well lit" after pic). I used to work in the medical device field and FDA/CE approval essentially come down to "do what you promise you do" and "don't hurt anyone." These products use language designed to provoke an emotional response, often in those with image issues, without specifically promising to address their problem in any concrete way.
* Products which are available through the mass market, but either marked up, repackaged, or subcontracted to reduce costs and increase profits (communications services, etc) at the expense of the customer.
If you know the signs to look for in these businesses, it's easy to spot the way they skate the line between legitimate and snake oil. If these products were of high quality, were a real value, and were genuinely something people needed, they would not require people to pressure their friends into purchases, "hosting parties," etc.
