You are looking from a different point of vie it seems. In your eyes you are mining with one CPU only and try to be decentralized.
I think (?).

So you think its is less expensive to buy one SBC whihc costs lets say 120$ as like a VIM3 for example.

Ok..

The ordinary miner is checking how much it costs and how rentable it is. So if it makes sense he wants to scale up quickly.

Now my point is what happens if you buy 28 of such SBC's

so 28x 120$ = 3360
Our Board costs currently at a low ammount of 100 pieces = 1499€ (at kickstarter)
= 1861 left for Modules.

For the SBC's you need:
28x Ethernet cables = 28$ depending on lenths
28x Powercables (not all SBC's do PoE) = 28$
And a PSU to power all of them = Don't know 100$
Or 28x 5.90$ if you choose psu per module

Let's say around about 156$ on top, you would save in first round of adding modules.

The idea of our board is that you can just replace the Modules with a new generation of Hardware.

So the invest of 1499€ for the board was done only once.

Now you have the benefit that you can use "cost-effective and flexible configurable Compute Modules", instead of just another fully equipped SBC with stuff like Audio, Ethernet, USB, HDMI and whatever connectors you just don't need again.

So the new batch of 28 SBC's would cost much more in the moment of investment, than the "second" batch of Modules for the very same "already" paid ARMedONE.

The third time you add new Hardware saves again money compared to SBC's
and so on.