we started at $0 revenue and $2000 initial deposit at citibank. over the next few years we put $millions a year through them, carried a balance of $millions in combined checking and mmf, and sold our company for $millions. now my personal accounts at the bank are in $low-thousands, and my post-sale money is in investment banks.
nobody from citi ever called, or cared, or said anything when i went to the branch other than one time a teller asking me what our business did because he thought we were a tech company and he really liked cloud computing stuff. i was happy to talk to him about it, and that was it.
99% of banking is boring and uneventful, it's just numbers on a screen, especially if you live in an area where big bank accounts are common (certain areas of big states like ca, tx, ny, etc.)
anecdote on an anecodte: when we sold our biz, i tried to transfer ownership of the account to the new owner, and the branch manager couldn't actually make that happen. he said i needed to write a letter (a physical, printed and signed letter) to the headquarters of citi. l-o-l obviously we didn't do that, so we just shut it down and cashier check deposited the balance to the new owner's account at chase - and they happened to have a branch literally 2 blocks away. i just walked in and deposited the check into his account #. the teller seemed like she did this sort of thing on a regular basis.