They do mimic the physical drug addiction thing, that early good hit, you just keep chasing it but it will (very probably) just never be duplicated. (not saying I know this from experience, just this is what's said) I know my early best experience with a old hard game, big death penalty, (original Everquest Kunark era) I've not had such a height of fun with anything since. Some fun here/there yes, but just not that length of time and level of fun.