I imagine that some of the parents in question are wealthy.frat brothers parents might have deep pockets JMO
But.... I would put emphasis on your use of "might" when describing the group as a whole. At the end of the day, they are a business fraternity from the University of Missouri. Membership is open to anybody with that major and who possesses a few additional qualification.
Though there is ivy in Missouri, it does not grow with the same level of thickness as with Ivy League schools. My guess is that the financial status of the parents would match the broad income bell curve of the United States. This would include wealthy individuals, but not many.