While increasing summer enrollment does help generate tuition revenue, that’s not the reason the State of Florida created this requirement.
Two of the states main objectives are to increase the number of degrees awarded,while also decreasing the cost per degree. By increasing summer enrollment, you decrease the average time to graduation, which free’s up more slots for students. Having more students taking advantage of the state university system’s resources, also reduces the average cost per degree.
Keep in mind that this same focus on keeping student expenses low, is why Florida has such low in-state tuition rates. I may not agree with every action the state takes, but I do fully support their efforts to keep the cost of earning a degree affordable. 