Yes its possible. Can try buy some site than already earning. Then flip it to earn more income,then resell it at 10x of the purchased value.
Do you any experience with site flippinf, blogging, domain flipping or affiliating? How did you earn those $50? is that through online? If yes, then the best way is to invest the same to improve what you are doing. You being a newbie here in DP, I'm sure that you will come across many suggestions and tips. But be sure that you are well aware of the process in which you are investing you hard earned $50. I suggest you to wait for some more time and learn the things before rushing to invest your money.
There are many systems you can do this with. It all depends on how fast you want to make the money and how much work you want to put, but need less to say, it will be worth it for the more work you put in! Cheers.
You can make several hundred dollars a day with freelance writing. I should know as I do this daily. Check my sig if you don't believe me. Even as a total noob you can quickly earn a few dozen dollars a day if you write well. Hope this helps. Monika
Try other online jobs such as freelance writing, well there are so many opportunities you can get on the web.
i think you can use that money to buy domain PR3-PR4 with good niche example real estate. after if you make a blog with that domain+good template. so you can sell blogroll from that blog or paid per review. not easy but profitable.