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.