So we got ourselves an island...

[Googi]

Originally Posted by ViperZakuto

once they figured out they give more exp they would...

A new player has no idea that dievils have been around longer than T-Rexes. As far as they're concerned they've both "always" existed. They don't distinguish between them as old vs. new but rather less exp. vs. more exp, and always chooses "more". Bigworms and lords give "high" exp not because they number of exp points you get for killing one is somehow objectively "high", but because it's higher than all the other monsters. If other monsters (in dungeons no less) start giving even more exp, then bigworms and lords just become "middle" instead of "high" (making obsolete the map trade in the process). Monsters are still categorized by high/middle/low and to a new player post-new monsters the "high" is no different than the "high" of today is for a new player of today.