Yоu аre cоnducting а reseаrch study where yоu want to obtain a skin biopsy from each child (ages 3 to 4) and have their parents complete a 20 minute survey all of which can be done at a single visit after consenting the parents. You want to be sure that you have enough participants so you decide to offer a $500 Amazon gift card for participating. Which of the following is the most likely concern of the Institutional Review Board?