I've seen one example of a retail trader who made about $500K by buying stocks at the 2008 bottom. The funny thing about it was that not only did he not have an internet connection, he didn't even own a computer. He was an old retired guy who watched the CNBC ticker on his television screen.
His first buy was Ford in 2009, and he held it for about three weeks and made a gross $52K profit on it.
Later in 2011 he bought Bank of America a few weeks before it bottomed, and I remember panicking on his behalf because he bought $400K worth of the stock, which was most of his life savings. Also during this time, he had purchased Alcoa stock which wasn't doing much in price appreciation, but he was getting dividends from it.
When he became sick and was in the hospital, I was setting up an apartment for him in an assisted living center. When I was getting his stuff out of his apartment for the move, I found all of these scraps of paper on his coffee table where he had been writing down stock prices from the ticker on the television.
The sad part of it was that he died in July of 2012 and never got to see his beloved Bank of America stock go to 18. His daughter inherited it and by that time the account was worth over a million.
So that's my offer to the discussion of retail traders making it in the market. I know it isn't much, but it's what I witnessed first hand. You could call it dumb luck, and I wouldn't really argue with you, but he was basically a value investor, buying stocks that he thought had been priced too low during a financial panic.
ETA: I forgot to mention that he also bought Fannie Mae stock which I think eventually became worthless. It wasn't much, something like $1000 worth of stock when it was only worth pennies.