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The Guiding Principles and New Rules
document is now in effect.
Is there a Pinny Arcade price guide?
How much are the pins worth and how much does it cost to buy them from PAX?
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If you're looking to trade buttons post-PAX, you might want to open a thread in the PAX forums for such a thing, though I'd be really surprised if there wasn't one already there. (Note: If there isn't one already there, you may want to PM the forum mod and make sure it's kosher before you open it, better safe then sorry).
As for value, it's going to be based on rarity and desirability. I don't think I need to write up a lecture about supply and demand here. Suffice to say those of us who didn't go to PAX vastly outnumber those who did, and it's pretty likely that those who want the pins are also a considerable majority compared to those who are willing to sell them.
Looking at the "Official Rules" I don't see anything about a 1:1 ratio. I don't think it'd be feasible to enforce such a rule anyway.
It's also important to remember that this is the first PAX for pin trading, and I wouldn't be surprised if pins like the G&T pins are the same at each con at least for the year. So the number of CTS Gabe and Zombie Tycho pins will increase dramatically once PAX Prime ends. If you are going to shell out money, I would wait and see what happens with the pins at future PAXes.
This is a very new thing, and you are liable to get burned if you try throwing money into it before things get stable.