If the University were to implement a system of "Illinibucks", students would be able to allocate these Illinibucks to these priority systems in order to "jump ahead" of other students based on their desire for a variety of things such as selecting classes, purchasing books, and selecting preferred campus housing. Each of these priority systems would have a designated Illinibucks price for each item in the priority system based on demand. For example, to jump to the top of a priority list for registering for a high demand class, one would have to allocate a greater amount of Illinibucks in comparison to a class with low demand.
Registering for classes is the easiest example to explain and therefore will be used to try and understand underlying issues that could result from using the Illinibucks system. Illinibucks would be used to jump to the top of the priority list for registering for a certain class, that would, presumably, allow the student, who chooses to use his Illinibucks for that class, to register earlier than the general population. This would ensure that they get a spot in the class, as well as allow them to choose their preferred time slot for that class.
The biggest issue that could arise from this is too many students allocating their Illinibucks for the same class. This would lead to overcrowding at the top of the priority list, and therefore would negate the need for the Illinibucks in the first place. Another issue is that their could be too many people using Illinibucks to jump to the top of the priority list, and would block certain students, who didn't use their Illinibucks, but are trying to register for a class necessary for their major. This could cause significant inefficiencies in blocking students from graduating on time. One third issue with this is if a class is undervalued, in terms of the cost to jump to the top of priority with Illinibucks, too students will jump to the top of the priority list, completely negating the point of having the system in the first place.
In my personal experience, I would have used Illinibucks to get priority in registering for computer science classes, in order to complete a computer science minor. As an economics major, I had always seen the practicality of adding on a computer science minor in order to diversify my abilities for practical applications in my career path. But due to the demand for intro level computer science classes at this university, it was near impossible for me to get into those classes. In this case the Illinibucks would have been extremely useful in allowing me to pursue this minor, as I would have most likely allocated as many Illinibucks to getting into those courses as necessary.