a Last thing, check your maths

:
1 key from your original pledge (KS, or SEA)
2 keys from the CE
you can sell 2 keys
That's what I said, isn't it? Or am I misunderstanding your comment?
For $95 a Kickstarter CE purchaser ends up with:
1 steam key (which s/he is currently playing with right now)
2 extra steam keys
For $135 an SEA CE purchaser ends up with:
1 steam key (which s/he is currently playing with right now)
2 extra steam keys
You're suggesting selling selling one of the keys (I guess to recoup some of the funds?). But there are several problems here:
1) Those keys are currently selling on trade for ~$15-$20, and likely to get lower post-launch as sales roll around (particularly the Steam summer sale). That's not enough to make up the difference of the extra costs.
2) As an SEA user you're losing a key (in the hopeless attempt to spend as little as the Kickstarter user) that the Kickstarter user doesn't has to lose.
In other words, if both the SEA and Kickstarter user sell all their extra keys, the Kickstarter user is still coming ahead on price. There is no way for the SEA user to pay the same amount as the Kickstarter user for the same amount of content (because the Kickstarter user essentially got the initial SEA $40 purchase included in his CE purchase for free).
The "sell 2 keys" bit is covered towards the end.