As far as the threads being moved to proper categories, that is done by a private contractor--Khoros. The moderators are not eBay employees per se, and they do not answer any questions on the discussion boards. The eBay employees who work with the community will move a thread only rarely, and the few times I've seen a thread moved by an eBay employee would not interfere with the time they spend answering questions.
People post threads in the wrong categories all the time; for example, sellers post every single topic on the Selling board, even if it's a log-in question or something that should obviously be on the Technical Issues board. They post questions about the GSP on the Selling board, when it's obviously a topic for the Shipping & Returns board. They don't care, because, well, they sell, right? So anything that enters their heads should go on the Selling board. It wouldn't matter how many categories or sub-categories or how specific or well defined they are--people post wherever they want.
In fact, eBay employees--generally speaking--respond to specific threads only when called upon to do so by someone tagging them in the thread. They are tasked with explaining eBay's position on specific policies or procedures--not to address members' individual problems with specific transactions or accounts, etc. That's a job for customer service.
