Should students still earn treasure box on Fridays, if they had 1-2 bad days during the week? If the behavior sheets for the day ranged from Excellent, Satisfactory, Needs Improvement, to Unsatisfactory, this would mean that the student received 1-2 days in the "Needs Improvement" or "Unsatisfactory" levels of behavior.
I like this idea, this will also get them familiar with earning, saving, and spending money.
I like this solution, students will also learn the value of currency.