The Big List Of Self Publishing & Merchandise
Never before in the history of mankind have indie game developers had more control over their audience and content.
There are no barriers because you can self release, market and distribute your game on your own and ignore all of the middleman.
It isn’t neccessary anymore to find a publisher in order to sell your stuff.
However being on Steam etc. certainly helps tremendously simply because of their massive audience.
Anyway here are some interesting resources in case you want to sell your game (and some additional optional stuff) on your own.