valuable and rare don't really go together.

there's a few games that aren't seen for sale very often like Twist, Big Wheel, Magic Ring, some of the barrel-o-fun/lotta-fun games, Crosswords, Double Header, Broadway '51, Parade, Bounty and some of the early mystic line games like Follies Bergeres

while double header and bounty would tend to fetch higher prices, the other ones usually sell for less than average. They weren't popular in their day so didn't sell particularly well, therefore the number surviving is lower.