I have known many parents who pay their children for honor roll grades. In some cases, this is okay. But, if you are a learning disabled (LD) student, the quality of your work does not reflect how hard you worked on it. Sometimes, your assignment looks great and is complete. Other times, it is a mess and there are lots of questions with no answers. This inconsistency can be due to a number of factors. For more information on this, see “What Does it Really Mean When a Child is Learning Disabled?" for help understanding the problems.
Problems with working memory, attention, vocabulary, anxiety, fear, or difficulty with executive functioning can all affect how an LD student performs in school. None of these relate to motivation. And none can be overcome by bribes to perform better.
For these reasons, I am against parents paying for grades in school. This is especially true for struggling students. Imagine working very, very hard and still getting a “D” or “F” on the work! Someone else whips off the assignment in just a few minutes and gets an “A.” Does that child deserve a reward when they rushed through and perhaps did not even do their best work? The LD child who is trying her best feels completely defeated in this situation. She gets more and more discouraged. She already calls herself “stupid,” and this, to her, confirms that verdict.
If you pay for good grades, consider whether or not you are being fair to all your children. If you are not sure, read "Is My Child Working Hard Enough in School?"
If that doesn’t convince you, read Nelson Lauver’s book Most Unlikely to Succeed. Lauver explains what happened to him in school when, no matter how hard he tried, he wasn’t successful. After reading his book, it should be clear why no one should judge another person’s motivation to learn.