Man. I wish I could get a good lunch that cheap nowadays.
IMO: If you eat it all, fine. But if you toss it because you felt like doing some experimentation, or just take it because "it was there", YOU SUCK.
The school is probably cracking down a bit because lettuce is unusually expensive right now. I work with schools and know that, that kind of stuff really adds up. My wife is a produce manager and tell me that it is $2 per head and relatively very expensive.
Like I said, eat up and enjoy. I'm a tax payer and think that lunch at school is a pretty good priveledge. But I think it is a priveledge and too many wankers sh!t on it by wasting it and take it for granted. Many of us that don't get it anymore sure think back nostalgically(sp?) about it.