Invest in crate 30's, 40's and the eventual 50.tf2 hats, buy low, sell high, hustle hustle shark, hustle shark, shark hustle.
I'm doing a Virtual Stock Exchange Game in my finance class. I'm in 3rd place out of 55 students, but 1st place is ahead of everyone else by like 10%, God only knows how. (I should ask them for advice on the market.) The way I make my money is by looking at stocks that are on the up and up, buy like 5000 shares and then sell when they go up 1%, rinse and repeat. Obviously this could go horribly wrong but it works as far as this game is concerned