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Because there is room to postpone a unit without anything feeling urgent, and the units keep arriving on schedule regardless. By unit seven a student can hold three units of backlog with no gap in the calendar to put it in. Shorter terms frighten people into staying current, which is a genuine advantage.

Usually a small number of marks and occasionally many more, depending on how many your syllabus permits before the grade is affected. That allowance is smaller than most students assume. The marks are lost far more often through not filing the alternative assignment than through not attending the session.

Only if you move through it. It is priced by term rather than by course, so demonstrating competencies quickly converts directly into money saved and hesitating converts just as directly into money spent. It suits people with real prior experience in the subject and should be priced as an ordinary term by anyone meeting the material for the first time.

Individually no and collectively more than expected. Ten weeks of small scored items adds to a meaningful share, and habitually posting at the close of each unit loses marks on both the timing rows and the reply rows. It is a scheduling fix rather than a writing one, which makes it cheap.

By share of grade rather than by number of units. Three outstanding units carrying forty percent is a different situation from three carrying twelve, and only the arithmetic distinguishes them. Ten weeks usually leaves more room than students fear, but the number should be established rather than hoped for.