This whole line of reasoning is self-defeating. If what you say is true, then I should go out right now and buy expensive cars and clothes for the sole purpose of attracting a mate. Which should clearly demonstrate that I am not financially well-off, smart, or responsible in any way. And it would mean nothing if I am unattractive in other ways.

>And unfortunately unless you're a doctor, lawyer, or CEO, 'having nice things' is the only socially appropriate way to signal that.

Meaningful conversation, a sense of humor, good looks, and an approachable demeanor are all perfectly socially appropriate, and they tend to attract people much more reliably.