Actually ghus jate hain I know in my last 3 trips. TTE take 200 per person and dont force them go out. They roam in train sleep in coridoors and between passenger space. It is worse than a sleeper.
In my last journey a group of 7 people with only 3 confirmed 4 WL tickets disturbed all neibours by whole night ki chatar patar...chatar patar....so bad experience