Earlier quoted context omitted.
That's not a reasonable answer. Many people want to buy assembled systems, and lack the skills/inclination to do it themselves. Pre-built systems is a huge $1B+ market, and "kill the market entirely" is not an acceptable answer.
Your business model is not required to be viable. I said don't ship them. I did not say don't build prebuilt systems.
And how the hell do you not ship them? You're not making any sense here. There's no alternative to not shipping them, not unless you're planning on having system builders show up individually to clients' houses and assemble PCs on the spot. That business model is way less economically efficient than simply assembling PCs centrally and accepting some breakage in shipment.