I do games as both a hobby and as a potential future income. Currently I've only a demo (soon to be full game) and game jam projects where I was a teammate, but me and my teammate are working to hopefully be able to be taken seriously as commercial game creators.
Honestly, I know it's really hard to get anywhere selling indie games, but I really want to do it despite it all, as games are something I loved since I was little, and making games for a living would be a dream come true. Until then however, we're just working hard to make the games we're making as known as possible, making the game look good, and doing game jams and work for other games.
I currently am not spending anything in marketing or other parts of game development, but that's because my teammate and me are doing everything ourselves, marketing, assets, so on.