I might have bought the base model iMac when they were announced, if they had the Fusion Drive option.
As things turned out, I bought the top-range Mini. It was available immediately, it had the Fusion drive, and you could upgrade the RAM.
The base iMac with 16Gb and Fusion would have been within my budget, (though I'm still peeved at no FireWire, audio in or Infrared, to say nothing of the optical drive).
Apple could have just posted a technical note on their website saying "Oh, here's a neat trick you can do with CoreStorage". But they didn't. They said "Here's a combination drive we're selling as an option."
Is it expensive? Marginally -- but a lot less than iMac SSDs in the past. (And although I've built my own hardware and taken loads of things to bits, frankly the idea of opening up or rather putting back together the iMac scares me, so I'm happy to pay for "installation".)
Did Marketing give it a high-fallutin name? Of course.
Has it encouraged loads of people to format their own SSD/HDDs together into a Fusion drive? Yes.
Having used thew Fusion for some time now (and I'm definitely well into the HDD in terms of used space), I have to say it's brilliant. You can't tell which device is being used -- it's essentially like having a 1.1Tb SSD. And THAT is worth $250.