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Not much.   For example, leave your SSID set to Linksys, and set your passphrase to some Rainbow table word, and there's someone running around with your key already.  

Add to that some reason to target you or your business, and your network will be toast very soon. In this case, you're operating under a sense of false security, which may be worse than none at all.

With such short simplistic replies, it looks like your only trolling for "posting credits".