Because it is very bad etiquette, most casino's have a one hour rule before you can leave the table. Trust me, once people know you, you will not be allowed to play. We had a lady that was banned at our game because once she made enough for rent that month she would leave. In a casino she would fine as long as she stayed the hour, but I promise other players would make her time very miserable and possible go after her and you do not want the whole table against you. The thing at our house games, it was the same people, low stacks just out for a fun evening with a set time. No one over time lost a lot or won a lot. So she was asked not to come back.