Prebuilts will always have to contend with the stuff you can readily buy. It seems they would be compared to stuff that "looks like it", so I expect it to be compared to consoles and small office computers.
I think it's a challenge to sell a product that's based on this board (+ case), a Ryzen 2400G, 16GB of RAM, 500GB SSD (for the "Plus" model) for let's say 900$ or 2200G, 8GB of RAM, 250GB SSD (for the "Base" model) for 600$. Ball park figure, I haven't worked out the pricing in detail. It'll depend where you'll want to sell it, but if let's say Newegg, OCUK and an equivalent in China. People will compare it to an Xbox or Playstation that's cheaper (for gaming) and as an office PC there will undoubtibly be many options from more well known brands. Because you won't entice the enthusiasts much with something that's already done. Unless you sell it as a barebones kit, but I guess ASRock would already want to do that
Part of the charm of SFF is also to build and customize these to our heart's content. It's maybe this process of building PCs that makes us respect SFF for what it is. I'd personally not consider offering prebuilt machines as the baseline, but consider a model that
@Josh | NFC uses: offer the choice for having complete machines but offer the unique parts of the product.
Because once you're offering prebuilt computers, you need a low enough volume that you or small team of people can do it in a reasonable amount of time while maintaining a profit. Or you need to start up an offshore assembly process that will require a huge MOQ that requires knowing you will be able to sell the needed units at the expected price to make a profit.