One thing thats changed over the years is that you can get crawfish 7-days a week, all season long.
Some places would do an all you can eat crawfish as a special or crawfish by the pound, but only on certain days of the week.
Up until lately it wasn't a common thing to eat crawfish. You were either at a private party, special occasion, or some other event. You couldn't go out on a Tuesday night and get crawfish. Even in south louisiana, most places had crawfish on certain nights of the week.
Now its a 7 day a week thing. You can find crawfish somewhere any night of the week. I think thats unprecedented.
There are historical accounts of the Houma Indians boiling crawfish. The Indians introduced it to the french. And the style developed into that we see today.
So even when the Indians were boiling crawfish, they probably weren't boiling crawfish every night of the week.
Who knows though, maybe they were.