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Hi I am looking for some help. Where is the best place to trade or auction Casascius Bitcoin? Sorry if this is not the correct section of the forum to ask,I’m new to this.
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Try marketplace... I can't remember the members who like this stuff (there are few reputable members) and they have some discussions about these coins in their topic! You will have to search for that alone!

Why do people value 1 full BTC?! Well there will be only 21 million BTC, now there is one wallet with 1 million bitcoins locked, many bitcoins are permanently lost... people can search for some calculations about it, and by some it looks like there is 10-20% fewer coins! So one full Bitcoin can give you an advantage one day!
You can have fractions of course, but 1 full sounds a lot better than just fractions...