If I’m remembering the stat correctly, making $150k a year means top 5% of Americans. So yeah, it’s rich. If you mean incredibly wealthy - as in, the top 1% (350k+ - I also might be a little off with this estimate), you’d probably be hard-pressed to find rich people who would want to publish their spending trail. The samples show the differences between the underclass (below the poverty line), average middle class (~40-70k national avg across major ethnic groups), and the middle & upper class. So no, the samples are not “worthless.” See the WSJ article for a more detailed article.

Careful, your racism is showing.