You get better tips from the other drinks and it increases bar income (that is then further increased by reputation).About the waitress job at the bar:
Is there any advantage to getting the editcs for new drinks, do I get new scenes/poses for having them?
Having more drinks just seems like a pain in the ass to remember who ordered what when I can just walk around with 3 beers all the time.
Also, is there any way to know how drunk Karryn is before she triggers the scene with the mug between her breasts?
It also makes it more sensible mini-game . Else its like "Beer? What do you mean water?! get out!"
It doesn't unlock any extra scenes /poses.
No idea about being drunk
No it's random, i was able to shoo them when they just spawned and they would go away and another time they wouldn't.Its about the timing, you shoo them away one step closer.
Sometimes you kick them and they go away another you kick and they keep comin back.
Maybe they have hidden HP but what that would be based on - no idea.