Now that I've been teaching high school for 5 years (on my 6th), I'd have to say that I've compromised myself in the following ways:
1. I praise any paper that has an actual thesis statement (implied or direct)
2. I actually think the bloopers at the end of their video projects are funny
3. I read adolescent literature regularly (except Harry Potter or Twilight)-- I haven't sunk that low just yet.
4. 90% of the documents on my computer are handouts for class, not poems or essays
5. I let my students write their short stories in any genre, even science fiction
6. I sometimes take my students' movie reviews as valid advice
7. I no longer bake cookies to bring to class, I just buy them
8. I let my students use my computer to print out their essays during class
9. I no longer go into my 5 minute lecture as to why "gay" is terrible as a descriptive for stupid things. Now I just say, "Yes, that's very homosexual" whenever they say it.
10. I expect much less out of a D student than I did 5 years ago.
I'm sure more will come up in the next year.