Why not? It's just Mercedes attempt at showing people that being a Mercedes owner isn't just about owning a Mercedes but a life style, kinda cool that they have nail polish as an accessory. Haven't seen anything like this in Lexus, BMW, Audi accessories catalogsReally now..?
Is mercedes trying to cater to woman and entice them with nail polish from a auto manufacturer.
The rest of the accessories though are more useful and serve a purpose.