It's Habit For Me.Living in Texas it's only Natural that you say "Y'all!" I say it all the time like for instance 'I'm ready to go to the party, Y'all ready?" Or "OMFG! Y'all are crazy!!" It's in my everyday vocabulary. And it's great to say. The Yankee's could never understand the fun we have with that special word.
I use it in everything! It never gets old and i love it!