I see no reason why you couldn't.

I plan on there being all kinds of factions of Summoners.

Most will probably earn souls in the Maze.
Some might earn them through thievery.
A few might purchase Summons low and sell high.
Valuable information can be traded for souls as well.


There could definitely be a group that kills and destroys wantonly in order to absorb souls, but ike you said, small returns. You have to pay a hundred every day and regular people are only worth a couple. I don't think it would be a popular or efficient option, since you can earn well over a hundred souls from only an hour or two on the upper floors of the Maze. If you're desparate, I suppose you could always go out to a forest and bulldoze everything in sight for a quick buffer. Might save your skin.