While I realize I'm not necessarily in the core fusor.net group, I've spent a fair amount of time lurking, and I feel I have some insight into the problem. First, the reason we have so many "will this ___ work" posts is because fusor.net has a highly abnormal forum structure. 99% of the forums out there are designed as discussion boards allowing people to get quick answers. This rapidly leads to dilution of quality posts, but also provides a responsive, engaging environment that keeps people around. Don't get me wrong, I think the way fusor.net is set up is a great strategy to make sure that discussion is razor-focused, but the newbs will always mess it up without adding a "confirmation of rules" step to registration (like a quiz). We can't get rid of this without heavy moderation. As a solution, I think we should point these folks over to the "fusor builders" facebook page where feedback is much faster, and there is no danger of diluting valuable data.
Beyond that, we also face a deficit of posts from the former .net powerusers such as Carl Willis and Jon R (and many, many others). We've also failed to cultivate new ones. Part of this may be that these users have moved on to other adventures, but I also believe fusor.net culture has a hand in it. While Richard et. al. have done an fairly good job promoting civility, there are a few users that seem to go unchecked. Just off the top of my head, I can think of at least two frequent posters that are aggressive, inflexible and often downright hostile. They will start an argument over the tiniest technicality, then drag it out even when proven wrong. This needs to stop, regardless of the poster's status. Note that I am NOT saying we should lower our standards of scientific rigor, but that we should instead enforce a general standard of behavior.
Further, fusor.net has a pseudoscience problem. If you take a look at our introduction section, you'd think this place is populated by fringey, alt-green-energy loons rather than people interested in plasma science and radiation physics. As part of developing a new introductory NukeE class (in which students might work with a fusor-like device), I showed a professor fusor.net. His initial reaction was that he wouldn't trust anything on the site judging by the "recent posts" section, as was replete with introductions from pseudoscientists. I had to spend an hour proving otherwise. To maintain any semblance of credibility, I think it is vital that we ruthlessly enforce scientific standards, and use the delete button frequently. For example, take a look at the recent introduction post by someone claiming to have a fusion energy solution without any data or even a plausible mechanism. That post should have lasted all of five minutes before getting deleted (and maybe earning the user a swat with the banhammer). While I realize this sounds cruel, something absolutely has to be done to preserve this place against the hordes of cold-fusion-quantum-woo cranks that fill the recesses of the internet.