How to make Serious Money??

[Ryan McElroy]

What strategy would someone use to make hundreds of thousands, if not millions, in real estate each year? In other words, what are some proven business plans investors have followed in the past to build their portfolio into a multimillion dollar business? 

At this point in my education, i understand how to buy single family properties/duplexes/triplexes/fourplexes, renovate them and then sell them for a profit. Then take those profits and buy an apartment complex. Then basically repeat. Renovate the apartment complexes, rent them out and then sell and upgrade to a larger apartment complex a few years down the road. This process has potential to make great money, but i'm curious as to how investors keep getting more and more and more rich? How do some investors make millions a year in real estate? 

Im not looking for a perfect strategy, I just curious as to how some people get so damn rich haha. 

Thanks, Ryan