I've also found that brushed Ti is pretty much invisible to the criminal element around here. When riding one of my painted bikes to work, I'm routinely offered a few bags by cornerboys.
It's very easy to take a painted bicycle and make it less attractive to thieves and other lowlifes with criminal element. I just don't see Ti as having some magical properties to prevent theft. There are plenty of painted bikes for sale out there, which are less attractive and don't attract unwanted attention....Then again , professional bike thieves know exactly what Ti is and it's impossible to fool them, OTOH a crackhead who is desperate to get his fix will steel anything including a Ti bike or a Wallmart BSO with a child seat on it.