Hey! Out of the 5 stores I have released on, steam is the most work and also the one that (temporary) costs the most. You get the money back when/if you sell for 100 USD.

There is a lot of info and a lot of graphics to create for the steam store. I think it can be a bit confusing how it all goes together with what you have to configure and how to upload your game. But, there is a lot of documentation to follow, developer groups to ask and a support that actually answer any questions within 24h. Do it once and then it makes a lot more sense for the future.

Steam is far superior to the others that they actually have a system that works to give new titles exposure and get views to your game. I definitely think steam is by far the most important store to release on and one that is worth doing so on.

If you release there and need any help, I'd be happy to help you out.