(To self: *refrain from smart ass comments*)
Yes, you NEED to enable WEP. Why, you ask? So that no one can see what you're doing on your connection, so that no one can use your internet connection, so that no one can compromise your computer(s), so that no one can exploit your name for illegal activity (warez, porn, etc). What is so hard about enabling wireless encryption?
I live in a house that has 10feet of distance (atleast) between each house, my router is in the center of the house and there is no way my neighbors can access my wireless. But, here is the thing, I don't know who my neighbors are, I don't know what they do. So I have every security feature enabled, doesn't matter if they pretend to know nothing about computers or not.