The point I was trying to make is that for less than daily service, unit and startup costs are usually higher. To make an informed decision, you would then have to look at what your projected revenue would be including revenue growth and compare it with other opportunities. You then decide which one makes you more money. While EK has started a lot of services with less than daily service, I also observe that trend reducing over the years. In most of those cases, daily service was not far behind. Perhaps they felt less confidence in the potential for daily service than at other places - I don't know, I'm just speculating.
As I said, I do think there is a lot to be critical of regarding EK's management of the flight operation, but there aren't too many airlines out there that rival their commercial planning. I don't know why specifically Cape Town or Toronto weren't justified by less than daily service, I was just stating that Emirates runs the numbers and in this type of decision, that's probably the best way to do it.
Certainly as tightly as Emirates is running the crewing numbers right now would also factor into it. If that is the reason, then it is an example of possibly saving a penny, losing a pound if it restricts their coveted "commercial flexibility".