Most of these editions won't be widely available on the shops either I bet, there will be specific versions for enterprise users or for ARM etc. The real choice will come down to 2 versions (or so) as it has with win7.
If you are buying the OS itself as an upgrade then it is probably because you want specific features and your going to want to be able to choose the edition you have.
It's a up-sell opportunity for PC sales staff too - people see the bottom price based on the MS Windows with all the decent functions removed. The sales staff will tell them they need to have MS Windows 8 Super-non-breaking-hacker-resistant-anti-mildew Edition instead ... oh and by the way now you've settled on that you'll need extra RAM otherwise it will run slow as anything.
The lack of knowledge about the different editions basically cripples a regular buyer's ability to decide for themselves.
AFAIK the only reason you'd need something other than Win7 Home is if you want to connect to an AD network or have legacy software you need to run.
You get features like encrypted folders etc in other versions but this can easily be replicated for free with software like truecrypt.
Tim Cook used to hand out Competing Against Time, which advocates reducing cycle time to increase variety (Apple tweaks this to variety over time, i.e. rapid development).
I agree, however, that consumers should have one version that smartly configures itself. Keep price discrimination for corporate/enterprise customers.
The key difference is Apple has "computer offerings". Microsoft doesn't. With my enterprise hat on, I don't want to pay for video editors, etc. Likewise, the parent buying a laptop for a child doesn't want to pay for full disk encryption that is FIPS compliant.
And they don't.
> This is just Microsoft's way of nickle and diming their customers
No, it's not. Did you even look at the different versions? Eval versions? Prerelease Editions? Enterprise editions?
You'll see three on the shelf: Home Premium, Professional, and Ultimate. The confusion is made up.