Mat Walk - Bathmat Slippers

I'm sorry, I don't really understand the Mat Walk, bathmat with built-in slippers. Sure I get that you can shuffle around your bathroom after showering without getting the floor wet or something like that, but I just don't get the whole WHY behind it. However, you just know that someone out there, right this second, just clicked on it and is screaming out loud, "Oh Hell Yeah! That's exactly what I was looking for!!!" or maybe not.