Well, I understand your positions, but don't want to argue.
/yeah, there can be long discussion. For example, I think that backers (all of them) mean much more for "Kickstarter Projects" than simple post-buyers. Because "no backers - no game". So, thats obvious, that backers have to have all that have post-buyers (I don't mean Kickstarter rewards, but I mean - what post-buyers can have). And its fair./
Anyway all developers are different (yours, CO )
But the question is still exists:
If "Hero Edition" = "Pledge $25"
then "Champion Edition" = ???
And another question - Is there will be an opportunity to buy an... "Champion Edition Upgrade" in steam store? A lot of developers provide such opportunity.