Why Do People Care So Much What Your Nails Look Like?

Lets put it this way, if someone had horrible, grubby fingers with lots of dirt under the fingernails, and the nails were stubby... what would you think? that they don't wash and maybe don't have a lot of money, but if you see someone with nice manicured nails and hands. You would think they are clean and quite wealthy. So it is all about what people will think of them..