527 Cafe (Evanston Taiwanese)

Enjoying another delicious lunch from 527 today (korean bbq beef sandwich, and the Taiwanese Fish Balls which are quite tasty). My jaw just about dropped though when I saw one of the specials they're offering right now - Taiwanese Brown Sugar Shaved Ice - for $7.50! I mentioned to the cashier (and possibly one of the owners?) that this didn't seem like a reasonable shaved ice price point, and didn't get much in the way of a justification for it. Anyone tried this? Is there something I'm not understanding about Taiwanese shaved ice?