Reason to leave them open (Score 1)

I always leave my WAPs open for this simple reason: the downsides of securing are much higher than the upsides. If I don't secure, what might I lose? 802.11 is pretty constrained geographically, and as long as people don't cause me to lose performance when I am connected to it, who cares. On the other hand, if I secure the dumb thing, everytime I take my laptop somewhere else, I have to reconfigure, along with lots of other junk. In essence, the cost of having it secured is very high, for very low in return.

My 2 cents.