A fundamental aspect of the capitalist system is accumulation of and investment of capital.
There is something of a great irony of the stock market.
Since you work hard for your money, you probably want it to work hard for you too.
Your choice of brokers will often help you to make some of the more complex financial choices, and may also restrict your investments.
Financial stability is a goal that should be high on any investor's list. One source of stability is diversification.