clipped from: blogs.payscale.com   
You do your job and, as far as you're concerned, you do it well. But if your latest salary bump wasn't as big as you'd hoped, you might be committing one of the seven deadly salary sins. 

Deadly Sin 1: Gossiping

Got a hot piece of office gossip? You may want to keep it to yourself

Deadly Sin 2: Obnoxious or profane comments

Communication should always be emotionally neutral and well thought out

Deadly Sin 3: Being disruptive

Deadly Sin 4: Heavy drinking

There is no down time when you are with work colleagues

you are always in a glass house

Deadly Sin 5: Sending angry emails

Deadly Sin 6: Dressing like a slob

take cues from how someone senior to you dresses if you want to be considered for their level of responsibility

dress one step above your job level

Deadly Sin 7: Bringing germs to work

If you are sick, stay home

people do notice whether you wash your hands in the bathroom and keep secret tallies among the group

Think that you may be underpaid? Compare your salary