I have been wracking my brain on this one and I think the C64 game did have a unique situation where 4 high Crystite would have to exist but I can't remember the details, but what you say about the high being in the store made something ring fainly...
That being said in this version it allows for 4 high crystites and actually seems to be the norm for now.
Four high crystite deposits is a bit much, especially since crystite has an undeniable advantage over smithore.