As a teacher, I reward the students that make the most effort. Although grades are not entirely tied to how hard a student works, poor grades are reflective of a lack of work ethic. If a student wants a better grade, just read a little more. I even give extra credit for students that read more than 180 minutes.
A = 180 + Minutes
B = 120 - 179 Minutes
C = 60 - 119 Minutes
F = 0-59 Minutes

The emphasis on reading is largely based on the research from Richard Allington. Allington cites four "background factors" associated with why students have difficulty with reading. According to the author:
1. the amount of reading that students do in and out of school was related to reading achievement;
2. children who spend more time on workbook activities versus reading text are more likely to have difficulty reading;
3. children who come from homes where reading is not modeled have difficulty reading; and,
4. students who have difficulty providing details and arguments to support interpretations of what they read have difficulty with reading.
According to the author, time on task is the best predictor for reading success in students. Put simply, more reading is equal to greater academic achievement.
The bottom line--if students read more, their grade improves and they become better students.