Originally Posted by Wrigleyvillain
Letting "all the neighbors" use your connection may be nice and all but it is really a bad idea even if it did not affect your bandwidth which it obviously is. Somebody's second cousin visiting town downloads something like cp and the Secret Service kicks down your door.*
+1: This too, you're liable for what they do on your network. It's also a gaping security hole IMHO.
*: Updated to reflect edited post.