You don't buy things from the website, you buy it from the people who scam you from the other side of the website. Fortunately I had a good experience. I have been waiting for some games on steam to be on sale for a long time. But, when I researched buying it from other sources, MMOGA was the first to appear. Little did I know I stumbled upon a great website. You can usually find games you want for about 75% off the price on steam, provided it's not on sale currently.
The way people sell these games at low prices is simple. They wait for the game to go on sale, they buy a bunch of gift codes of the game, and they sell them at a discounted price to anyone who could not make it to the sale. Simple.