To get rich, why don't people invest in investments that banks invest their money in?

Since banks get super rich by investing your money, what stops people from finding out where banks invest and doing the same?

Because banks get their money from using your money and borrowing it to other people for, basically, free profit. You could start your own bank but it would take millions of dollars.

Banks invest large sums of money.

You can make the same percentage, but the larger amount that is invested, will obviously make the bigger impact.

Banks have huge teams of people working for them doing research before they make any investment decisions.

And also: The best fund managers are the ones that are never seen on CNBC or Wall Street. They keep a low profile to keep the attention off of themselves.

Banks don't invest money.

Banks want your money to make investment to get higher returns. If the banks tell you come and share with me and get the same returns I get. Thats like building a castle in the air. Eg Credit cards; banks get its money from savers and borrow to the credit cards user to earn higher interest whereas banks only pay you a little interest for your savings. Not many people can follow what the banks invest as it will need a huge capital. Maybe I can suggest you open a brokerage firm. ;)

Banks invest our money.

It depends on your time horizon. Banks are interested in 30-40 years in the future.

Few individuals can plan that long.