I believe that teaching, especially at a grammar school level, requires a huge emotional commitment especially for good teachers. It's not merely a job though on paper and in the eyes of most adults, it is. I take that into consideration when I look at the job as a whole and when I evaluate the type of skills my child learns in the nurturing but demanding environment we call the classroom.
As stated on other posts, I also realize that a teacher's position and career decision is a choice much like mine or yours. I do feel, however, that a good teacher's commitment is not only to the job as a whole but to individual students and their needs. That dedication involves an emotional and mental commitment that most people do not have with their respective positions. Therefore, I feel that their commitment to my child should be recognized and appreciated by me whenever possible. In my eyes, it's an entirely different relationship because a teacher's dedication to his/her job usually includes a commitment to molding human beings into responsible adults, a job that we, as parents take very seriously.
I will always recognize a teacher as a special human being, largely because I know I do not have the vocation to mold children into productive members of society but realize the importance of that mission. They are helping parents raise the future. Whether it is through a special note, a gift, or just a quiet word of heartfelt thanks, I believe a good teacher deserves recognition for helping me to educate my child.
Maybe that's too simplistic, but that's how I see it.