Another instructor (another adjunct) that I vividly remember also got me to attend every class. But it was because there was a severe penalty built into the syllabus if you missed even one class. We hated it. Everyone in the class resented the fact that we were being "forced," through threat of punishment, to attend the class. We would sit through his long lectures and plod through his boring exercises wondering why it was we absolutely needed to be there. It didn't help that it was Editing at 8:30 on Friday mornings, but if our Technical Writing teacher had been the instructor, we would have been there, no matter what.
This is the problem I have with attendance policies; it gives students the wrong incentive to attend class. if I am doing my job as an instructor, students will understand the utility of my class, enjoy (or at least appreciate) the learning process, and willingly attend. If a student at this level doesn't yet understand that attendance matters, then docking them a few grades won't help; if anything, they'll end up resenting you, your class, and your policy.
A number of my students have told me about the zero tolerance policy their high schools have developed in regards to attendance; if you miss a day for any reason not deemed acceptable, you get detention or suspension. Most of the time, however, those students who are "forced" to go to school are disruptive or don't bother doing the work required of them. No amount of punishment seems to change their attitude towards school and schooling; they see it as a waste of their time. I want to make sure that my students don't think that I am wasting their time.
That's not to say that there isn't a stick that goes along with the carrot. The students learn very quickly that every day we do a variety of activities in class that directly relates to their upcoming (or in progress) essay assignment. All of these activities count in their final grade. For me, the incentive isn't that they lose marks by not being in class, but that they miss out on important practice and preparation for major assignments. Doing well in my class isn't about just attending, it's about actively participating and working on what we focusing on that day. I have a number of students who show up and either sleep or just stare at me during class. The quality of their writing has not improved.
I want to be more like my Technical Writing instructor than my Editing instructor; I want students to want to attend my class, not feel that they have to attend but are wasting their time in doing so.