The easiest form of online money involves you having a huge amount of money to buy low and sell high. My clients did NOT grow overnight, it took some of them years to save up enough money to build their businesses. It took me a long time to learn how to sell eCommerce to strangers online. I had to learn sales psychology in order to create sales volume and flow. I don't do seo and wait for results, I pump ads, viral campaigns, posting on deal sites with REAL deals. These people who I work for get a surface pro 4 max option for 35% cheaper. They aren't going to eBay and Amazon and looking for price drops, THEY CREATE THE PRICE DROPS!
Its called money making money, and the game is easier if you understand how the people work and how money works as well.