Originally posted by: dullard
There are many reasons, including intangibles. But the main reason that banks want savings is due to a law restricting the dollar amount of loans they can have (this was passed in part to avoid problems that banks had in the great depression).
Suppose a bank has $1 million in savings accounts. Then the bank can make X*$1 million in loans. Sorry but I don't know the factor, X, off the top of my head. Lets for fun, just pretend X=5. Thus that bank can legally make $5 million in loans.
Lets suppose that bank already made $5 million in loans. What if the bank wants to make more money in interest and loan closing fees? Well too bad, that bank is already at its legal limit. The bank has 2 options: (1) sell some of its loans which reduces the income from those or (2) increase savings.
Obviously the biggest bank profit comes from increased savings. That answers your thread title. What about your post as to why banks like large customers? I'll answer that with a question.
Which is cheaper for the bank: (A) finding 1000 people to put $1000 each into 1000 savings accounts and the paperwork and transaction losses associated with each or (B) one person who deposits $1 million? I hope I don't have to answer that question for you. Remember that the bank loses lots of money with each transaction each of those 1000 accounts make.