Generally speaking, the most expensive cats in the world are likely to be rare or high-value breeds, such as Bombay cats, Persian cats, Maine Coons, and Devon Rex cats. These breeds typically have unique appearances and personalities and may require more care and attention.

In addition, there are some special cases, such as cats with special pedigrees, appearances, or histories. For example, a cat named "Kitty" was auctioned for over $400,000 in 2016, becoming the world's most expensive cat. Kitty is a shorthaired cat with a special pedigree, considered very valuable, and it received a lot of media attention and coverage during the auction.