It would be nice to have an ability to create earning goals that don't depend on any sales (and therefore last indefinitely until completed). Use case: setting an earning goal for a free game to start working on its update once the goal is reached.

For anyone who wants this functionality right now, there is a way to cobble together something like that on your own (it won't be connected with your itch.io page), you'll need to utilize serverside API, specifically `my-games` method: https://itch.io/docs/api/serverside#reference/profilegames-httpsitchioapi1keymy-...
You can access info about your earnings per game from there.