Earlier quoted context omitted.
They measure motivation by how hard the person works at achieving that goal, of course if you measure it that way the pills will "increase motivation". ADHD isn't a failure of motivation, it is a failure to put in effort doing stuff you are motivated to do. It doesn't magically make you motivated to do stuff you don't care about. > You might be right, but, at least for me, the number of tasks that meet that criteria…
Doing taxes and bills are not what I consider high reward more like moderate penalty. And, no, I don't pay my bills: everything is auto-pay.
Try not paying bills or filing your taxes and you will see what happens, doing the task prevents you from getting a severe punishment (relative time spent on the task), so it is high reward. People with ADHD tend to be late paying bills or doing taxes and struggle with filling in forms in general, ie they regularly fail to do simple high reward tasks.