Well before this thread turns into another full blown protest about the original store change, which most of us hated, it's worth noting that that was
not what OP was complaining about. OP's issues:
... there needs to be either blank space under these items or a “confirm” button for crystal purchases.
Somebody else already pointed out that there was indeed a confirmation popup, but no amount of confirmations can help if we don't pay attention and are just conditioned to click them away.
I personally think that there is enough space between items, and each item already takes up the center 1/3 of the screen height wise.