Can you get rich day trading stocks? Well, let me ask you this. Can you get rich picking garbage up?
The answer, yes. (I know some people who own garbage companies and they do very well for themselves).
So what's my point?
My point is if you can get rich picking up garbage, you can get rich doing just about anything. And that would include day trading. I bet you can guess what I think of day trading now. Look at it this way. One of the biggest enemies of a trading system is transaction costs.
It's the reason trading isn't a sum zero game. It isn't because of transaction costs. That makes it a negative sum game. In day trading, you rack up many more transactions than anyone else ever would just trading normally. So you have a huge thing to overcome there. But it gets even worse. You have less opportunity to profit.
The price swings that happen in a day are relatively small compared to the price swings that happen over time (say over a week). So you have less opportunity to profit, and you have many more transaction costs.
Now if you approach day trading as say a way to get a better fill in a trade, but it's a trade that you will hold for a period of time (again say a week or more), then yes that is viable and can work. The key with trading is to give yourself a chance, and you really don't with traditional day trading.