The methods explained above of course only relate to legit video game testing. By this I mean you get a game you play it you fill out a form your done bam next job. There are other ways of earning money by playing games.
Firstly there is the MMO way of money making. This basically means you jump into your favorite MMO, let’s say World of Warcraft, and you perform services such as leveling characters selling gold for money and selling characters you level. You can also write guides and sell those but it is completely up to you. The income generated by this method is completely determined by how well you can advertise your goods and wares but this can generate a decent income.
There is also competitive professional gaming which basically involves you and potentially some team mates going to and participating in large gaming tournaments and winning prize money. Of course you have to very good at what you do but this can generate a very large income for small amounts of work.
For an extensive guide on how to become a video game tester see gametestinggrounds. A full review can be found here. This guide is the most popular and proven to success guide on the net.