On that same note of security;
Anywhere you park is going to have risks, even if you park in a designated hotel parking garage, they hold very little (if any) liability for your car or personal belongings. On the street, in a private garage, or a public parking structure, it doesn't matter, they all have relatively lax security, with the possible exception of a Mall's parking lot, but those are NOT 24 deals, and if the mall security catches you leaving your car and not going into the mall, they will tow you. I worked at Llyod Center for quite awhile and I know this is a favorite pasttime of security, not to be taken in a positive or negative way, they will tow your car at your expense if you abuse their lot.
In congruence with what Tom has said, it is cost that we are looking at trying to reduce, and while I don't have a factual set of incident reports, I'd say the numbers seem to be low enough to warrant our focus on lower costs. If for some reason, money was no object and security was a serious issue, it'd be a different situation. But as of now, we are looking to keep things cheap for you, the attendees. This doesn't mean sacrificing quality, it just means looking at more options and trying to get a deal.
Ugh... my wallotextitis is flaring up, better stop now while I am concious of it!
~Allykat