This game was a gift this past Christmas. While I'm not sure why it has a $20 price tag, I will say that it's loads of fun, packs up into it's own drawstring bag (yay! no boxes to reinforce with tape), and can be enjoyed by everyone in our household (ages 3 to 44).
Our older two use their math skills for score keeping, and I love watching them formulate their strategy. Our youngest just finds the fun in the stacking of the pyramids, and can keep herself entertained for some time.
Quality, built to last. Considering all of this, I suppose $20 is a steal!