As someone who frequently encounters bugs, let me explain why I don't usually bother to file bug reports: No one cares.
Choose any large long-lived open source project at random and search their issue tracker and I guarantee you can find at least 3 open bugs that are 5 years old or more. I know, because I've run into these bugs, as have dozens of others, and went to report them only to find they had already been reported years ago with no action taken by the developers.
Filing bugs takes time. You're going to want reproducible steps, you're going to want logs, you're going to want me to try different things. That's fine, and I'm willing to do that to get my bug fixed, but only if I think you actually give enough of a shit to fix it. I don't enjoy wasting my time any more than you do. When I see 5 year old open issues your tracker, where several users have chimed in, submitted logs, etc. and you've done nothing, I assume you don't care so neither do I.
Worse yet, many developers are downright hostile to users reporting bugs or, god forbid, making feature suggestions. Spend five minutes in GNOME's issue tracker to see what I mean.