re: What's the most cash you've ever withdrawn/deposited from/to a bank?

Lots of regulations to prevent money laundering. Avoid large and frequent cash deposits and withdraws if you don't want to be on the feds radar. The $10,000 rule isn't set in stone. You make a bunch of $5k deposits or some other questionable transactions, they're required to report it.

No one is laundering money for profit in the US except the government dammit!