I haven't quite finished volume 1 yet, but it seems like he could have had some summons running around floor 1 collecting money and goblin cards for him while he grinds lower floors (or even while he's not in the dungeon at all?). Even if summons don't gel with his fighting style, that's something at least worth trying to see if it's possible.
Subcategories
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Ascendance of a Bookworm
If there aren't any books, I'll just have to $@#! up society until I get them!
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How a Realist Hero Rebuilt the Kingdom
Step into my office and let me tell you about crop rotation...
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My Next Life as a Villainess: All Routes Lead to Doom!
Can't die by the hero's hand if all the heroes love you!