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If all your competition sells Intel machines at the deep OEM discount but you choose to sell AMD and Intel machines forgoing that deep OEM discount for not doing as Intel requests; your hooped. Your Intel machines sell at a higher cost or you take a noticeable smaller profit margin. Either way, your screwed compared to the other OEM vendors.
I don't think it's the company in cahoots with Intel so much as no company willing to take the risk of paying more for processors and chipsets than the other computer retailers.
Now, if there are companies that said "that's a great idea, I'd like to see only Intel chips available, let's do it!" - well, that company should be taken out behind the barn and buried beside Intel. But too many things run on Intel for it to go away without effecting the market and evidence of conspiracy with OEM vendors may be hard to come by.