It's not irrelevant. Intel makes CPUs by the millions. The added cost of all those quadrillions of useless IGP transistors is spread out across all SKUs. Even when the IGP is fused off, you are still paying for it just as surely as you are paying for a portion of their R&D in every chip you buy.
Indeed, they make millions of CPUs. How many of them do you think that are going to be used with a discrete GPU? The IGPs have utterly destroyed the entry level discrete GPUs, the only people that needs a discrete GPU now are the ones that actually uses it, since mainstream use cases are fully covered by the IGP. The gaming crowd is a minority of the PC users, and are not worth to develop and validate a new die with no IGP. You are in a sinking market, deal with that.
And as I stated before, Intel charges you 10-20 U$D for the IGP if you compare equivalent models with and without (Mainly Xeons, but there were Core iX examples). The IGP is actually cheaper than the stupid Unlocked Multiplier from K series Processors, which Intel usually charges you 30 U$D for, more if you add the required Z Chipset cost, and doesn't even require any R&D cost to capitalize.
The only capability I care about on an Intel IGP is the capability to not use it. They are worthless for modern AAA games.
I can't take seriously comments for people that talks about gaming and don't even consider those use cases where the IGP QuickSync does wonders to encode on the fly while recording gameplay or streaming, something that many modern gamers do.
If you don't like the Intel IGP, go into BIOS and disable it. If you don't want to have the IGP at all, buy the HEDT platform instead. The Xeon E5 1620-V3 is nearly equivalent to a Core i7 4790/6700 and cost around the same.
If you dislike that there are wasted transistors, you may as well rant a bit about how the GPUs evolved from fixed function devices to a GPGPU that can do compute and a lot of other things that are worthless for modern AAA games too. Or the Video Encode/Decode engines that the GPU have, for that matter.