the store itself is downstairs in the basement (a lot like Batman's storage place in the new movie) the glass is just where the entrance is and if that breaks (which I highly doubt) it wouldn't be as big of a problem as most people who have never seen this store in person might think. (there are a lot of skyscrapers that are completely made out of glass now a days and if you think all glass is like your kitchen glass then you need a boost of glass tech development)
I too love my jailbreak for some apps that App store does not have.
MX Tune for you tube video download, SB Setting and Display Out.
These three are the most important for me.