If money doesn't concern you at all — you're in the artistic domain, not in business one.

Then just go and create whatever and however you feel like.

If you're talented and lucky enough - something will stick some day.

It's useful to stay within some niche for enough time to build solid skills. To have a backup plan of regular job if you're not lucky.

Maybe I was confusing artistic with business domain.

Could open source really "really" earn money? I am not sure now.