I have spurts of creativity, and then I may be silent for a bit. To be honest, what was always missing for me was the ability to leave more detailed feedback.
I find that if people seem interested, or engaged, it inspires me. Even just discussing story ideas makes me think about adding more. Or even when someone adds somewhere I think I have an idea for.
I think others may be in the same boat...that they may be encouraged by more feedback.
If anyone wants to try to figure out any ideas with me, I'm always happy to be a sounding board, and I lurk in the Fiction Branches IRC chat 24/7. I get notifications if there is any activity in there.