It seems as every g2a.com site wont allow me to enter. Source: 11 months ago

And if you don't know how to build by yourself, you can also pay those shops to do it for you. It might be around 10-15 rial without windows, and I advice you to buy windows key in g2a.com. Source: 12 months ago

It's either what you suggest or buying them in websites like g2a.com, recharge.com, etc. Source: 12 months ago

Don't forget to add Windows to the list, you can find it pretty cheap on g2a.com, it's a key reseller, only ~$25 bucks for a copy of windows vs $100+ retail. Source: 12 months ago

I am really poor like so poor that saving up 5.50 euroes was smthn, so I take my money and go to g2a.com only to accidentally click on the wrong card and buy a steam TL currency gift card. I'm so sad that now I won't be able to get those 5 euroes to my acc it will take at least a week for me to re-save up. Source: about 1 year ago

If you still want an estimate you can check on Steam Spy. Source: about 1 year ago

I think Valve will shut it down once it learns about the monetization. AFAIK that is what happened to https://steamspy.com/ when they introduced paid subscription tier. - Source: Hacker News / over 1 year ago

If you still want to see numbers, you can try with Steam Spy with VN available on steam. Most of the developers say that those numbers are false. Source: over 1 year ago

Research popular game genres, for example on https://steamspy.com, and find a genre that currently sells well. Source: almost 2 years ago

Steam Spy - must have tool for anyone who wants to get some data about Steam games. Source: almost 2 years ago