Thinking about his strategy so far is quite something.
Dungeons are supposed to be feeding off the "desires" of the adventurers delving in it. So what is best than to feed off the endless pursuit of beauty to women and maybe in the future, the endless desire of men to just fucking kick back and take a vacation.
To make it more tempting, make the monster drops single use only and would be better be used in a hot spring place or after using the hot spring that way, people can't just sell it outside because people would just use it in the dungeon.