Presidential Dollar Coin & First Spouse Medal Set XP1 Worth $200?

One of the Presidential Dollar related products issued by the US Mint last year is making quite a stir on the secondary market, but I am not sure why.

It's the Thomas Jefferson Presidential $1 Coin and First Spouse Medal Set, US Mint Product Code XP1. The sets have been consistently selling for over $200 on eBay only a few months after selling out at the Mint for $7.95 per set.

Here are the current listings for the set.

Here are the completed listings for the set.

This set was issued along with three other sets, for each the other three 2007 Presidential Dollars. Each set contains an uncirculated Presidential Dollar and a bronze medal for that President's Spouse. The sets went on sale at the Mint on December 3, 2007 and were priced at $7.95 per set.

Here are the final sales figures for the sets provided by Numismaster:

2007 Washington $1 and Spouse Medal Set	16,736
2007 Adams $1 and Spouse Medal Set	15,496
2007 Jefferson $1 and Spouse Medal Set	15,853
2007 Madison $1 and Spouse Medal Set	15,690

Why are the Thomas Jefferson Sets selling for so much?

I have not been able to find an explanation for the huge premiums being paid. The Thomas Jefferson set sold roughly the same number of sets as the other three Presidents, which sell for a more reasonable $10-$20 each on eBay.

The sets appear to contain coins which can be easily (and much more cheaply) acquired elsewhere. The uncirculated Presidential Dollars can be obtained from many sources for close to face value. The First Spouse bronze medals can still be purchased individually from the US Mint for $3.50 each.

Is this premium being paid basically just for the packaging of a unique set surrounding common coins? If so, why only the Thomas Jefferson Sets? Is there something else unique or special about the set that I am missing?