Not me, but I do make a living from creating bespoke businesses solution for my clients up and down England using B4A and B4J (and sometimes Visual Studio).
Saying that, right now I could not develop a game if my life depended on it
@andymc, well not unless I spent months and months on it constantly learning game development and doing absolutely nothing else, my brain is wired for developing bespoke business solutions and not games.
I've watched a few YouTube videos on indy developers like yourself, these bedroom developers make a living through Android and iOS apps though. The one thing that they all had in common was quantity. They all had 30+ games bringing in the dough for them. One developer from the UK had well over 50+ games and apps on both Android and Apple stores, basically the same on both. He had ads running, pay to remove the ads and also pay for some simple upgrades which he said the upgrade route doesn't really pay that well. They all basically said that quantity was what was working for them.
If I remember correctly, the UK developer was making in the region of around £7.5k per month minimum, sometimes reaching £10k+. He also said that he has now left his daily developers job and spends more time with his kids at home. He now only works 3 days a week and never on weekends, that's the deal he has with his wife. I just tried finding that video for you but I couldn't find it again on super busy YouTube and I don't have my YouTube history turned on. But if I do manage to find the video again, I'll PM it to you Andy.