I only reply to threads I feel I can contribute, or if I feel like contributing. The reasons I click on a thread could be many, whether it is the poster I know, or the title, ect. Lilith said it best, just because you get lots of views but few replies, doesn't mean it is not interesting. Not everyone feels compelled to post...

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"And as we all play parts of tomorrow, some ways will work and other ways we'll play. And I know we can't all stay here forever, so I'll write, my words on the face of today...and then they'll paint it" - Shannon Hoon