Is rich cat rare?

I'm curious, is the term 'rich cat' referring to a specific breed of feline that is considered rare, or is it a colloquial expression used to describe a wealthy individual who owns a cat? If it's the former, what makes this breed so unique and sought-after? And if it's the latter, is there any truth to the idea that owning a cat can somehow lead to financial prosperity? I'd love to hear your thoughts on this intriguing question.