There are a few reasons that I think would lead to courses with
high COP.
1) The availablity of slots. If the take-in is low, it might lead
to high COP. For example, if the take-in is 40, and lots of people
with L1R4 range of 10-15 join in, most likely the COP of that
course will ended up with a range of 10-15.
In-take for Mass comm for SP for 2007 is 100 and NP is 185.
2) Popularity of the course. With low in-take and high popularity,
you know what will happen...
High popularity? Maybe the course is fun or interesting?
So doesn't mean that course with high COP will means it have better
future. I'm sure you can find some people here with lower COP
course doing well.