Credit worth is tricky. I'll let someone else take a stab at that but...
Green Wreath: For sale during holiday 2005 as a "gift a friend" item for a little over a week. Was not something you could just purchase from the shops. Was not sold during holiday 2006. Therefore: rarity, medium, increasingly so.
WDW Contemporary Pin: It's from Hotel Seris 2. It was sold in 3/24/06 - 3/24/06 for 500 credits. So... relatively scarce considering number of players playing then, the number of "still playing" and of course deleted accounts from players who had them on old accounts.
Monsters Opening Pin: It was for sale 1/27/06-1/30/06 only for 1000 credits. Taking into account the above factors, fairly rare. Also, 1000 credits "back then" was a lot. In my experience, 1 of the more difficult pins to trade for, but they're out there.
I am sure someone will correct me if any of the above is incorrect. Hope this helps.
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