The article's predicate is that rollercoasters have no purpose, but then seems to explain what their purpose is. There are far more things in the world that are "purposeless" than rollercoasters, if amusement is insufficient.

As someone who appreciates rollercoasters and psychoactive substances, I've made comparisons between them. A good ride will make you feel weightless one moment, four times heavier the next. You'll feel adrenalin, awe, fear, and catharsis, all neatly packaged in under five minutes, usually a good deal shorter than that, and with fewer contraindications.

Rollercoasters and psychedelics can be a great pairing, too, but your mileage may vary, of course.