After School...Is it worth it?

I teach a book club after school on Monday afternoon. I have 9 boys and they had to apply to get into the club. I have been disappointed in their commitment and wonder if the $25 an hour is worth the headache. On most days, only about half of the boys show up and 2-3 of the ones that are there don't have their book. How can you participate in a book club when you don't have your book? We started the book club as an extracurricular class thinking the boys would enjoy the book and start reading more. They have enjoyed the book, There's a Boy in the Girl's Bathroom, but I am not too sure they have started reading more. We have had fun discussing the book, but when you're tired the last thing you want is another hour of undedicated, unprepared students. I hate to stop teaching because they are already short teachers in the afterschool program, but I don't need one more thing.