[daemoens]

If you're buying the CPU separately, it means you'll be building the PC yourself, not a prebuilt. Upgrading the GPU instead of the CPU will give you better graphics performance, which is what most of the people building one want. The only reason iGPUs have such a large section of the market is because of people buying regular prebuilt to use as a general computer, not a gaming one.

[jeffbee]

That's not obviously true to me. Is graphics-intensive gaming - and I would point out that defining "gaming" as GPU-intensive would be too narrow - really that large of a market? I've personally built dozens of PCs and the last time I bought a GPU it was a 3DFX Voodoo.