In some situations you get a 3x boost with the acorn another gpu would give you 1x boost, and at a massive power use, the acorn use 15W, im sorry to say it but I thnk youre to dumb to see the advantages here.
This definately aint for your standard newbie miner that dont know shit about the inner workings.

I hear the resale agurement a lot, well guess what noone wana buy your shitty gpu's with fans sounding like they are about to die.
You might offload some of them to some idiots that dont know shit, but then youre a shady person.
I see more resale/reuse potential in the acorn, its a xilinx fpga with quite fast a pcie bus, you can reprogram it to do whatever you want, accelerating all kinds of shit. Be that video encoder, data processing, bruteforcing, you name it.