From the page: "The survey doesn't have an explicit end. You can continue for as long as you'd like or come back later to do more." So, no, it doesn't have a point at the end.
i'm guessing they want to address the notion that women perceive colours more accurately than men (as opposed to just giving them fancy names they learnt from style magazines). i think maybe it checks that you were consistent in the naming of the same colour, or what colours there was most uncertainty about
Ambiguous question - There is a a point to the survey, but no endpoint to the questions.
I could only stomach 30 or so... once I exhausted all of the prismacolor marker colors I could remember, it became oddly exhausting.