When you submit a bug report, you're certainly helping--but you're helping
other users
and yourself. You're not helping the developer (if they hit the
bug in their use of the software, they'd just fix it).
I'd have to disagree with you there Mr L. Non-descript bug reports are
useless of course but well-constructed, up-to-date bug reports are surely
of use to a developer who cares about his project but doesn't have time to
thoroughly test it- which is the case for most FLOSS devs. Just because a
dev hasn't spotted a flaw yet in their usage of their software doesn't mean
its not a potential showstopper for other users of that app.