Hmm, this thread.
I don't believe people go read a thread just because someone "popular" made it. It's simply by choice and what interests them.
For instance, someone makes a preset request thread and none replies. No need to get angry and hurt over it! Not EVERYONE will make you a free preset just like that, and don't forget some users don't know how to make presets.
Onto the roleplays. What if the roleplay doesn't interest them? Maybe it's not their style and maybe they're not comfortable with it, so just leave them be. You can't make people interested in something they don't like.
Onto common discussion threads. If the topic has previously been discussed or is simply not interesting, people may not post. But don't forget that there are people out there that will gladly discuss anything with you, so don't get butthurt over someone not posting the second you make that thread.
Sorry if this seemed kind of rage-ish. Remember I'm not directing this post towards anyone in particular. -Slinks away.-