Just want to point people over to a great blog post over at TaoSecurity - Black hat budgeting. This is an excellent article which starts to examine the economic factors related to attacking and protecting information. Thinking in this way really puts some perspective on the security budget that people spend on attempting to protect information. Long story short - if you don't think or don't know if bad guys are targeting you - find out (what information are you protecting and why?), and if the bad guys are targeting you - you should be thinking this way.