Ive taken to time to write a simple script for this using AutoIt. I know I didn't use Exume, sue me.
Its pretty simple.
Setup your cards in a fashion where you more or less can't lose.
I use cards with low refresh times that gives 1-2 points and require nothing as well as mixing in cards that give 2 yellow and use 2 yellow and have them all run back to back.
Your opponent uses the same cards no matter what type of game. So fit your deck to beat his.
Then make a macro that plays ALL 5 cards at once.
Then basically play the parleys that you know you can win without problem. Normally setup right u can win 2/3 or 3/4 availible parleys.
I then setup a delay for my script, knowing all the parleys are over to wait until they refresh. Rinse/repeat.
Though I haven't found a huge use for the crap I get from them, the only info buyer I've found seems to be broken. I think you might be able to get some sweet crafting recipes from various craft NPCs around 350 diplomacy, maybe less.
I'd give my script but due to the setup part it would take me days to explain. Write it yourself. You might learn something. Never thought I'd ever catch myself saying that..
Ophidian