Happy hour part 2

So I enjoyed happy hour last night because of the atmosphere, the good company, the free super-spicy Chex mix, and of course the beer. But what I enjoy most is the price of said beer. I had a Bass and several Coors Lights while Amanda had an Amstel Light, a Bass, and a Cl. Total price? $13.75. Sure, the first round was free because we sat at a table for a while before I just went to the bar, but I also covered Randy's first PBR as a small welcome-back gift. That just blows my mind.

Which brings my two dilemmas: #1 Do you need to tip as if the beers were regular priced. At 15%, the tip would have been like $2.50, which seems cheap. What to do? I always overcompensate for beers that were comped and I generally over-tip as it is, but I feel like tipping based on happy hour prices is almost like a punishment to the server for the cheap prices. #2 Once school starts again, how legitimate is it for me to be out drinking beers from 9-10:30 when I have to be on the road by 6:30 to get to school on time. I feel like it is economically wise to take advantage of cheap beer, but it seems like I should be able to lay off the cheap beer in favor of a better performance the next day in class. So how often can I go to happy hour and how many beers can I drink without compromising my morals? The devil on one shoulder says Thursdays are good days for a video, but the angel on my other shoulder says that I have to be a responsible adult and a positive influence on the youth of America. Should I tell the angel to chill out and have a beer? What's the public consensus?