Why all the haunters must be messy and ugly?

I see what you are saying, but you have to understand that hunting doesn't really pay the bills. That's why Bela does it for money, therefore she is always clean and has all the goodies. These guys are always scamming and half the time don't even have money for a hotel. They stay in abandoned houses, which probably don't have running water. Hunting demons is a messy job and it doesn't seem as though showers and laundromats are always readily available. These guys make a living of going into woods, basements, dark alleys and anywhere else that is probably messy. Plus, they are going to fighting, getting dirty and bloody. They aren't going to fight in their Armani suits.

Yeah you're rigth.... really don't know... but Sam and Dean aren't looking messy and ugly :D