Damn. Couldn't be me. Maybe I'm a bad contributor (yes) but I will definitely pop in to fix something that's bugging me and then never contribute again. I'm not adding new features though, so maybe my contributions are just never significant enough for me to feel any ownership of. I think it's a lot to expect people to continue to contribute just because they did so once. That would potentially make it less likely people contribute when they can. I'm certainly not going to address an open ticket if it makes me responsible for rewriting the feature when people decide to port or refactor the whole project two years later.