It takes 5 people to close a question as duplicate. When one person flags it, users with 3,000+ reputation go to a review queue and vote on either closing it or leaving it open. And, in the event of your question being closed as a duplicate, but it really isn't, edit the question and mention that you've tried the solutions in the linked question but it didn't help. Once you update your question with that info (within 5 days of it being closed), it'll automatically go into another Reopen queue that users will vote to open. Usually, those queues don't take long.
Also, if you've already tried some solutions that you found (on this site or anywhere else) before you post a question, you should list what you've done in your question instead of saying I've scoured the internet, but none of the solutions I've found so far seem to work.
Also, you say that people "flag them as duplicates when they're clearly not", but after reading your WiFi question and the linked duplicate question, they seem very identical to me: Fn keys not working, no WiFi switch, rfkill says hard blocked. Whatever thoughts make you think they're clearly not duplicate should be stated in your question =).
Also, by the way, chili, the person that initially marked your WiFi question as a duplicate, is pretty good with all wireless issues =). I'm not saying "take his word for granted", or anyone else for that matter, but he knows what he's doing. And if he marked your question as a duplicate incorrectly, then you probably didn't include enough information, for example your wireless card adapter make.
Read more about closing questions here: http://askubuntu.com/help/privileges/close-questions