Banks: a non-Rhetorical question

I don't understand why banks always take up prime real estate on busy street corners. Is it just that they're SO rich that it doesn't matter how much they spend on location? Or is being located in a high-traffic area actually a worthwhile investment for a bank? I understand that the sense of respectability and solidity conferred by brick-and-mortar is an advantage when your whole job depends on making people trust you with all their money EVER, but aren't they taking it a little too far?