Walking a cat on a leash

So, my next door neighbor walks her cat on a leash twice a day. I though she was out of her mind, until I saw another lady with another cat a couple blocks down walking her cat too. Her cat took a poop and she picked it up in a poop bag like the responsible pet owner she is. I decided to do a little research. Turns out; walking your cat "is quickly becoming one of the hottest new trends for cat lovers here in the USA."