I deposited $30k once at one bank in a city with 40k inhabitants. On that day, my balance was maybe $100.

The person at the cashier barely looked to me when I get in. “Good afternoon”, she said while looking to the screen.

I put the cash on the counter and said “I want to deposit this money”.

Instantly, she started to be all nice to me, and asked the manager to come over.

After the deposit, the manager talked to me for 10 minutes, asking whether I expected to continue to work with the bank, and they could set me up a “premium account” depending on amount I were to bring.

You see, managers are paid commissions/bonuses based on how much the bank brings in in deposits. This is one of their primary goals.