It's not ridiculous because it was the result of the study done by the authors of the book. The fact of the matter is that the
typical millionaire--i.e., person with a net worth of at least one million dollars--does
not buy tons of shiny new toys. Yes, some millionaires do, typically the ones who are worth 10-100 million rather than 1 million. But the typical one does not.
If you know some millionaires who do, all this means is they are actually not the "typical millionaire," no matter what you might think. You also need to take into account the fact that a lot of people you might think are millionaires actually aren't, because they've spent their money on assets that depreciate rapidly. This means you could have a salary of 1+ million a year and still not be a millionaire if you spend it almost as fast as you make it. Look at many of the sports stars who go broke within two years of retiring--yes, it happens very frequently. They were never millionaires despite what everyone thinks.
Example: my uncle is a marketing executive, lives in a very nice house in an extremely affluent area, only stays in the nicest hotels, etc. Except his family probably has a net worth of maybe $100k at most. They're not even close to being millionaires. Why? Because they spend most of the money they make. If he were to lose his job, their entire lifestyle would grind to an incredible halt and they'd be forced to change everything they do just to not burn through their savings. If a millionaire loses his job, it's not a problem.
You're under the very misconception that the book seeks to correct. In any case, your anecdotes really aren't sufficient to destroy the results of a pretty solid study.