The problem, as everyone else already sufficiently pointed out, is that oftentimes, the seeker does not understand his own problem well, and will therefor have a hard time distinguishing good from bad answers, or will even not want to hear the good answers.

Of course, it's not the first time you're asking a question in this vein. The problem you are trying to solve is, I believe, fundamentally unsolvable. If someone asks a question that requires specific skills in an area that isn't common knowledge, it is a matter of luck whether their question will be answered. It's pretty much a matter of statistics, odds and probably Murphy.

A note to add is that I find that even when people ask about unusual topics, if they know how (not) to ask questions the smart way, esp if they keep trying to figure out their problem on their own and then later come back to post a reply with their conclusions so far, their chances of getting useful replies, with at least good pointers if not so much as a solution, are greatly increased.

Makeshifts last the longest.