Those numbers are suspect to you because they don't back up your feelings on the subject. You have a feeling based on your previous experiences in Dynamis, I have numbers because I run the linkshell and I keep records of the runs for every sponsor ever since I changed the system. If you choose not to believe my numbers, then let us consider the reasons that CoP runs drop fewer coins instead.
1. Nightmare creatures, aside from the ones in Tavnazia, are incapable of dropping a hundred-piece of currency, therefore, hundred pieces are less common.
2. In order to get the time extension, you must defeat the boss (again, aside from Tavnazia). In order to defeat the boss, you must weaken it by killing sub bosses. Sub bosses are stronger than normal enemies in the zone and therefore take longer to defeat. Sub bosses do not drop currency.
3. Spawn density is lower in CoP zones. That is to say, you must spend more time running between kills than you would have to in city zones.
4. Enemies in CoP zones are generally stronger and have more debillitating abilities because the zones were released at a later time and therefore designed for players with merits and more complete equipment. From sheeps 30' sheep song in Valkurm to mandragoras 15' nightmare in buburimu- the creatures are just plain tougher.
5. Movement patterns of enemies in CoP are generally wander patterns, unlike cities where everything follows a pre-set path. The chaotic wandering makes it harder to control pulls to the level desired so you more frequently wind up with more enemies or less enemies than are optimal for your group at the time.
6. Nightmare creatures can drop a maximum of 3 coins. City mobs (not stones) can drop a maximum of 4. Hydra corps in Beaucedine can drop a maximum of 6 coins.
So what this all means is that you can kill more mobs in a city zone in 2 hours than you can kill in 2 hours in a dreamland zone, AND city mobs are capable of dropping more single pieces than nightmare mobs, AND there are more chances for a hundo in cities than in CoP zones.
If you still hold your belief that CoP zones are as good for currency as city zones, then I guess the only tool I have left is to point out that you admitted to quitting Dynamis previously in this thread, whereas I have been doing it nonstop for more than half a decade. But for the sake of argument, let's say that I'm wrong about all of this and CoP runs are actually better for currency per hour than cities are. There's still the problem that city runs are better currency PER GIL by a magnitude of about 300%, which means this update will slow my sponsors down to 1/3 their upgrade rate and increase the cost of them completing a relic threefold if I stick to only CoP runs.