Actually they take exactly 2x Damage In open mouth.
Which is why Atonement caps out at 1500 on them Open-mouth, exactly 2x.
Secondly, calling everyone who has better gear than you a gilbuyer is the most retarded and childish crap ever.
Thirdly! Rather he buys gil or not , its not the point, its that everytime someone with better gear says something stupid its always "I'm gimp cause i don't buy gil like you lololol".
Most of the good gear now a-days can be farmed or bought on the AH for under 200k (MOST).