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<p>If a campus and its facilities and staff are underused, then increasing enrollment could reduce the burden on the state if the tuition and fee revenue from the additional students (even discounted for in-state and financial aid) is greater than the marginal cost of adding the additional students, even if the average cost per student is greater than the average tuition and fee revenue from the students.</p>
<p>Berkeley spring freshman admissions is probably done to keep the campus resources at capacity in the spring, since fall enrollment would otherwise be greater than spring enrollment (due to students graduating a semester early or a semester late), leaving unused (wasted) capacity in the spring that would still have to be paid for.</p>