why bank is rich?

i went to HSBC to check my account balance last 2 days and i found out this.

HSBC got 5 cash deposit machine, 2 cheque deposit machine, (total 7) for ppl to give money to them. but they only open got 3 ATM machines which give ppl chance 2 take money from them.

so, is bank money suker? or u and i so stupid 2 let them suck our money??