I'm an attorney and if I come into work in less than peak condition (I don't ever drink, but I do have a 2 year old that has caused me much sleep deprivation), I bill fewer hours in the day.
OK assume you are working on a case for a client. Of the total billable hours, assume your work represents less than 1%. Then imagine that your firm is going to bring in someone who is going to do your job next week, and your billable hours will not even be needed except maybe looking up precedents for a couple of hours a day(practice). No matter how hard you try the next day, there is no way they aren't going to bring in this new guy to do your job.
I see these two situations in the same light. I would not blame you for hanging out with some buddies until the sun comes up.
Well, I guess part of it is about doing right by your employer. Money doesn't grow on trees and I believe in the old-fashioned notion of an honest day's labor for a day's wages. It's not fair to the employer to make them pay for anything less than a full day's work. Since we're throwing out hypotheticals, imagine having a job picking blueberries where you get paid by the bucket. It's a very fair system in the sense that if you're lazy and only pick 2 buckets worth, you're only going to get paid for 2 buckets. But someone else, working the same 8 hour shift might pick 15 buckets. Same hours, but different pay based on the value provided to the employer. But most jobs don't work like picking blueberries - you get paid a salary and there's an expectation that you'll put in the necessary effort to deserve that salary.
I'd be ticked if I was paying a guy nearly a million bucks and he didn't bring his A game to the table every night.
The other thing is that your hypothetical is rooted in selfishness. Whether your contribution is 1% or 70%, there's an expectation that you'll give the full 1% or 70%. If everyone who's contribution was 1% only gave half effort, then it would be like everyone give 1/2 of a percent. 1/2 percent across the board is 50%, which is a lot less than 100%.
The prospect of bringing in Marbury shouldn't change anything. Pruitt is still under the obligation to be ready to play at anytime.
Anyhow, that was a long-winded rant that could be summed up by saying "I think your logic is wrong."
EDIT: And speaking of doing right by your employer, I've got to get back to it at work and bill some hours!!!