[FireFly]

That's exactly it. Their reasoning is that instead of having a 'last call' where everyone rushes to drink more before it's over, they won't ever have one, avoiding that rush.. also, they won't kick everyone out at the same time, which often causes issues on the streets outside the bar. If everyone knows they can drink at whatever pace they want, and then leave whenever they feel like it, there won't be so many people rushing to get hammered and then getting into fights with everyone else who all had to rush to get hammered and had to leave at the same time.