At the high school where I teach, students are expected to have their parents call-in and excuse their absences.
So, I follow the same policy with the guy I train under. If I can't make it, I make sure to call and leave a brief message. I consider it a matter of courtesy and respect.
So anyway, I've started requiring the same courtesy from my students. Students with good attendance and all absences called-in get a reduced rate. The rest go on "probation" and shape up or drop out!
If teaching the martial arts is also about teaching responsibility and respect, I don't think it's a lot to ask.
I agree with you 99%! Yes, teaching the Martial Art is about teaching responsibility and respect (in my opinion), and it is not too much to ask, or require. As others have said, small schools tend to be affected by unexcused absences, but any size school would be serving their students better by teaching them this positive habit that does help them in the real world (friends, job, etc.). You have given very good reasons for doing this, and agree with all of them whole-heartedly!
In small schools, advanced notice lets the instructor know what to plan for in class. Larger schools proceed regardless, but one option is to have the student address the instructor upon the next day they attend class. They should apologize for missing the previous class, and give a reason. The instructor can decide what to do from there. My larger schools have been run 5 days per week with students showing up to whatever class they can make for their rank level, thus there is no unexcused absence unless they miss an entire week. I keep attendance, and a certain percentage is required to test. I do require assistant instructors, and all Black Belts to call in advance with good reason for missing class, or if they will be late.
When I was in Korea, some of the Grandmasters there actually drove their mini-vans around the streets and alleys of Seoul, picking up young students after school as they stood waiting on the street corners in their Taekwondo uniforms. If students were not present at the beginning of class, the Grandmaster was on the phone, calling the parents and asking them where their child was. They were very insistent about attendance, and treated it more like mandatory public school attendance - - but that was in Korea.
In the U.S. we can either reject students who are going to place the Martial Art on the same level of soccer and beach volleyball, and only teach dedicated individuals who want to sacrifice and place priorities for a few years on something very important, or we can accept the less dedicated students and try to mold them over time, but giving most of our attention to those who already value the training as being worth many times more than what Bill Gates could afford.
I like the fact that you reward those who do not miss classes; it is good psychological, positive reinforcement of good behavior. However (here is the 1% where I respectfully differ with you), for the same psychological reasons, I would not employ any punishment for negative behavior (probation, kicking students out, etc.). I believe we are there to help them acquire these positive attributes over time. Some will get it quicker, but I don't want to give up on a student simply because they don't have good manners yet. Perhaps, those with perfect attendance each month can be rewarded by ordering a piece of training equipment at a huge discount (50%, or 75% off).
Sometimes, at a testing or other event, you can bring up one or more students who have good attendance, in front of all the parents and other students, and give them a gift for free, and maybe a certificate or ribbon for perfect attendance. If you really want to encourage students to call in to excuse an absence, bring up a student who does this, and compliment them saying, "Even though Johnny has missed 3 classes this past month, he called to let me know why he wasn't going to be here, and I really appreciate that... so, here is a free uniform for your outstanding dedication and good manners." See how many start calling in after that!
Chief Master D.J. Eisenhart