Just a warning to those using this guide or planning to.
Changes are coming with 1.08, and i will adjust the guide accordingly 
Quote
Wyatt Cheng - Game Designer
Scorpions have had their XP reduced. Sorry to be the bearer of bad news. We looked and considered buffing everything else instead,
but in light of the multiplayer buffs we were already providing, we didn't want to inflate the game as a whole even further.
Specifically, Scorpions have had their XP reduced by 75%. That probably sounds like a lot at an emotional level, because it's
never fun to have a source of XP reduced by that much, but I hope some can agree if you think about it - a mallet lord is worth
1.5x the xp a scorpion is. And that's not just mallet lords, most of the monsters in the game are within a certain reasonable ratio
of one another and the scorpions were a very obvious outlier.
Source:http://www.reddit.com/r/Diablo/comments/1bjorz/developer_journal_multiplayer_improvements/Guess the days of MP 10 Arreat Crater 2 Scorpion runs are over.