the first commercial downloadable game I released back in 2015, that let me become a full-time indie developer, has done roughly 25% of its revenue over the last four years on Mac. This is adding together the % of copies sold on Steam for Mac users, and the Apple Mac Store, where my game was featured on the main page for three months. Notarization, and 64-bit support, and all that aside, the audience on Mac that you can sell to is massive, especially since a lot of developers just ignore the platform - I'm fully expecting to support as many macOS devices as I can for my next game.