You should to. Most of us spend or speculate. Invest in things you understand. Invest cautiously, wisely, and regularly. Know and obey the distinction between gambling, and putting your money to work for you.
Most people try to increase their income, and that's a mistake.
Making more money means paying more taxes. It takes time and hard work. And, when wealth arrives in the form of cash, it's easier to spend. The poor and middle class don't realize how much they pay because it's deducted from their pay check. The wealthy know there are legal and appropriate ways to shelter income, to invest in socially-responsible ways, and that the tax code encourages this.