Forum:"The most efficient Sticker Factory"?

The wiki page for CD Factory gives a suggestion for a high efficiency factory. It's the typical set-up where all Sandbags are led to a single point with conveyor belts. The step-by-step creation guide says you need to chose the large stage template, to increase the available surface area for item spawning.

What I don't get is: why does that matter? Spawn rate doesn't change with stage size, and if a CD/sticker spawns far away from you, it might disappear before it reaches you with the conveyor belts. So it seems to me that a small stage would be better.

Could anyone explain to me what actual benefits a large stage gives?