This app was mentioned in 2 comments, with an average of 12.00 upvotes
I released my first game for iOS and Android a few months ago. It costs minimum $125 to put the games on the stores. For Google you pay $25 and you're a developer on their store for life. Apple you pay $100 a year, because Apple.
I've probably made my money back at least haha. Selling my game for $1. Mostly to my friends and family. I've run some ad campaigns in different places but unless you have thousands to spend on advertising or your game gets viral it seems to be a luck of the draw.
Edit: As someone pointed below I probably should have posted links to my app. :) Here ya go! iOS Android