If it was me, I'd have a way higher margin than 27%, just because when you're selling a prebuilt the margin on the parts is not profit.OP already did this with the component sale price being 27% higher than the pre-built buy cost. That's sell price to consumers, not what price point they buy at direct from manufacturers/distributors. Add on bulk pricing discounts and they are easily reaching a healthy GP. Guesswork at its finest.
E.g. it has to take into account the longer-term customer support, shipping, installation damages, returns. I don't envy anyone who tries to make a living out of selling PCs.
The amount of threads I see on tech forums: "I just got my PC and x", with complaints like: "it just feels slower", "it stutters randomly", "it can't run x program I got 15 years ago", "it is supposed to hit 300 fps and I'm getting 200 fps", I'd lose the will to live dealing with this every day

