I disagree that coding for fun and making it a product is 5-10% difference. I would say it's closer to 500-1000%. I coded a lot of tools for myself, for productivity or for fun. Currently I'm very quick in doing that thanks to LLMs, it's definitely not vibe coding, althoug there is a lot of code generated. As these tools serve only me, I may not care about code quality, about bugs, about someone elses data loss, about security, GDPR, different devices, mobiles, screen sizes, platforms, etc. I don't have to support "users" as an entity at all in my apps, it can be all hidden behind VPN, so i don't need auth. I have so many little issues in my apps so I know I can not for example click this and that in rapid succession, or drag this thing out of this container etc. It's 100% fine for me, it would absolutely needed to be fixed for other users. I would need something like a user manual, marketing page, payment processing? I don't get any support e-mails and angry users. There are many compromises that I can make with little value loss if I code just for me as compared to trying to offer a service for people and ask for money.