Even as a combat spec, it would be very difficult to get all 3 chests in Mana Tombs as a lone rogue. Minimum you have 3 mobs to fights, which is certainly doable with adrenaline rush and blade flurry (sapping a mob at the start) - I've done that for the first chest and it did yield a nice blue.
However, the second and third chests are guarded by 3-4 mobs each (3 is ok, 4 is...well, even with evasion, AR, and BF, 3 64 elites is bound to make you hurt quite a bit). As for SV, you're dealing with 3-4 lv 70 elites there, so I'm not quite sure how you would go about snagging those chests. I could see duoing this quite easily as rogue+druid or dual rogue though. 1/2 the gold, but much easier, especially if one of the rogues is imp sap.
I'm not saying it's impossible (it's not, mana tombs is possible at the very least), but it IS rather tricky and involved some nasty group fights and a little luck. Perhaps Shao could offer some suggestions on how to go about this?
My personal favorite is Arc, but they've made adjustments to the chest spawn so it's not nearly so lucrative.