I was simply elaborating because Elwyn seemed to be under the impression that the SEA user would have an extra key over the Kickstarter user, be able to sell it, and then essentially end up having paid the same price (which is not the case at all).
At least, that's the impression I got from her comment. I may be totally off on that.
I was actually referring to the problem people seem to have that they first paid for Steam early access and then, as CE was announced, they wanted to buy CE and did not know what to do with their SEA key (and wanted to get a refund for it or asked larian to get a discount for CE instead)
As for kickstarter backers, it is a completely different story - Kickstarter backers usually get a discount/bonuses/goodies etc for their support in the (early) game development. I am actually quite surpised to see the CE discussion somehow revolve around Kickstarter backers and that they get additional steam keys with the collector edition. The point is during the campaign you could add an extra D:OS key for as little as 20$ and no one seems to complain that in SEA you do not get such a discount. So, why should one then be upset if Kickstarter backers also get a better deal for the collector's edition?