Unfortunately, no. Marbles from exp mazes are even worse than before, only 5. Given all the new Tabulas and runes, SE really needs to readjust the marble reward.
RE: Manaburn Voucher 02: Might or might not work. The mobs might track you down no matter where you are, but they might go back and idle in the pit. Plus, they might come 1-3 mobs at a time, rapidly, not just one huge wave, so you'd have to have add control such that you're sleeping them close together. Manaburn Elementals might be the way to go.
Voucher 02 could be a lazy man's way of farming marbles. No need to run through 3 sets, they all come to you!
Also, there's various paths on the map, which might lead to a map 2, map 3 etc. Unsure if Sneak / invis will work to scout the place out. My LV1 mule has his work cut out for him . . . . .
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