The Reality of our "Content"

The entire point is having a viable choice, not having carbon copies of the same map.

Is it about having choice or the illusion of choice? I can guarantee you even if there were no "to the left" (in reference to your images) or MP3, there would still be places that would be the #1 place and everyone would flock there like the left monsters. You can argue that people would have more choices since there are more monsters that give the same amount of EXP, but how many people would train in those places? How many people would go to Big Spiders at 70 instead of Sand Rats? The spawn for Big Spiders is less and the map is bigger compared to Sand Rats. There's not a single class that would benefit more from going to Big Spiders instead of Sand Rats. Aqua Road would be crossed off virtually every training list anyways since water physics in Maple aren't very conducive to moving around easily.

I see your point, but it's too unrealistic. You're looking at Maple (as well as every other game, since virtually every game does this) too ideally when you need to look at it realistically.