In many gaming novels, good monster-grinding spots and field boss spawn points are basically monopolized by large guilds, leaving casual players with no choice but to go to places where monsters are sparse and difficult to farm.
The setup Ye Feng created avoided this entirely, because the "wild monsters" he generated spawned randomly, and so did all kinds of items.
Of course, once a "dungeon" appeared, its location became fixed, though its initial appearance was still random.
Chapter 458