Vast majority of users don't care for the source code, nor even know what source code is. And personally, as a developer, I never bothered to look at the source

Vast majority of users don't care for the source code, nor even know what source code is. And personally, as a developer, I never bothered to look at the source code of software I've used, much less fix or extend it - and that goes for all the devs I know personally.