If your DPS isn't a raw 25k (default 5% crit and 50% crit damage) you're not guaranteed to 2-3 shot Sark... that alone will boost your GPH a couple hundred. Don't listen to people that say gold between NM-Hell is only marginal compared to Inferno Sark... The difference is also a couple hundred GPH.
To add: Get a crossbow and drop the Sharpshooter.
To add: Get a crossbow and drop the Sharpshooter.