First of all, for your age and your almost next to nothing experience you have almost the right mentality but not consider stock market a game nor a hobby, it is a ruthles place where you can lose everything in a matter of hours.
Your thoughts on why the last 3 years videogame stocks have seen astronomical returns?
I do not consider it a game. I put a lot of time into following news (both general and business). While I made a loss in my first year, I got above 0% at the beginning of the year and I'm well above break-even now. My unrealised result/proft since I started trading was at its highest point on 1 October 2018 close at +40.67%. Of course the crash of the last month didn't help and I'm a lot lower low - I lost little more than half of my unrealised profits. I plan to quit when the profit gets too close to 0%.
The big rises of video game stock in the last three years are mostly because of microtransactions and the abilitiy to let players spend money regardless of their play time. Someone who buys FIFA every year used to pay only 60 bucks for the disc and was covered for a full year of gaming. With the addition of Ultimate Team and its card packs, that same player is able to buy whatever how many packs he would like to buy. With the help of analytics, companies can improve their techniques: how do we present these packs/boxes, what is the golden price point, what do we need to do in order to get someone to buy their very first pack/box, etc. The big rise in the last three years is mostly thanks to the utilisation of these techniques, growth of scale, and lower risks of losing a successful product (once it's successful). It's of course also nice for shareholders that video game companies aren't reliant on launch date revenues anymore: the game continues to make money well after its release. And with annual games like Call of Duty and FIFA, that means every quarterly and yearly performance has become much more predictable.
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Edit: however, I feel we're hitting a limit, and it looks like the mobile bigwigs in Japan are experiencing that problem now. The western guys may face the same problems in the near future.