The 1999 silver proof state quarter sets (10 coins) are almost $300. Can someone tell me why?

I'm trying to understand this. Any idea what percentage of $300 might be attributable to 1) first set in a series 2) lowest mintage of all the sets 3) silver prices and 4) Christmas season. Any opinion if the 99 sets will increase much more in value??

Proof Silver Coins Ending Soon on eBay:
2009 Battle of Balaklava 1oz Silver Proof Coin CV= $125

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