For a hobby that is thought of as a creative outlet most of the people playing it are just not that creative.
That could explain the lack of responses to threads about fluff. But I'm grateful to the creative people that do exist. Whenever I have a mind fart, I get excited when I post online looking for ideas. I love hearing what the creative crowd throws my way and I can't wait to read the replies. Even if there are not many responses. I've implemented lots of things that people threw my way.
Even crunch-wise though, people lack creativity. A lot of character builds you see are nothing more than something that a player just went online and found. Maybe not 100%, but most everything was compiled together in his build based off of aspects that others suggested in optimization forums. I really don't like DMing those type of players. The last player I kicked out of the group insisted that his build was thought up all by himself. He had only been playing D&D for a couple of months, but I could point to the exact threads where he copied his build. He didn't deviate an inch from the best known 3.5 Conjurer builds. Even right down to the obscure alternate class features. His choices were flawless, including his spell selection. But he swore to me that he was just good at optimizing characters and likes to read all of the sourcebooks.

None of my other players bought his BS, and it was actually them that talked me into kicking him out. That wasn't the only reason they didn't want him around though.
I don't mind going online to look for build help if you have an idea in mind but can't find rules to make it happen. It's when a player flat out copies a build, or parts of builds that I don't like. As a DM, that's extremely uninspiring. I'm not really interested in DMing someone elses PC. I want to DM your PC. There seems to be too much emphasis on "power" with players these days. They are so worried about not being the best, that they have to go online to get tips on how to be the best. I'd compare that to you saying people playing are just not that creative.
Even worse, is when I see players starting threads to ask strangers how to deal with events happening in their game. Uhg. So now their DM isn't just DMing him, he's DMing the entire gaming community. It's like their PC found a library with internet access and is asking for advice on how to deal with the local evil necromancer and save the princes.