Of course they voted it down, their energy policy is good marketing for their target audience. The bottom line is still the reason for the policy.
Actually, as someone who tends towards the conservative side of things, I'm 100% happy to see that Cook said what he did. ROI is not the end-all, be-all of running a company, and worshipping it to the exclusion of all other considerations is a bad thing for any company to do. I also like the sustainability movement they're taking... it's not a "surrender" to "government intrusion" as the NCPPR is claiming. The government has no hand in how a company decides to get its electricity, and a sustainable solution does make good long-term sense.
Stereotypes aside, he "target audience" is not as homogeneous as you think. I strongly suspect that my ideological leanings clash very hard against those held by the "target audience" you're thinking of, but I mostly prefer Apple's products because they're quite solid, and in my experience last far longer than anything I've ever bought from its competitors. There are exceptions of course (I prefer having an Android phone so I can tinker with it), but overall the "target audience" doesn't buy an iPhone or MacBook Pro because the company is somehow approved by The Right People(tm). I posit that they buy the products either because of the reputation of solid products with excellent customer service, or they buy 'em because of some fashionable cachet.
Consider a parallel: Linux' old-school maintainers included everything from flaming ideologues for the 'progressive' side (Alan Cox IIRC was among this number), and flaming ideologues for the 'conservative' side (Eric Raymond stands out here, very strongly.) Yet everyone agreed on a few politically-neutral philosophies centered around Open Source, and a strong disdain for the slipshod-but-monopolistic coding practices of a certain dominant competitor.
Long story short, Apple made their business decisions not out of some stupid political ploy, but have laid out strong and logically sound philosophical reasons for doing what they do. Folks may not agree with them, but at least there they are, and they're not hidden behind some mealy-mouthed corporate-PR-speak.