Now that's something worth considering on a $10,000 bike.Velosurance (Markel) theoretically covers theft for full stated replacement value of your bike, if you're looking for a standalone policy. You do have to tell them the details of the bike upfront and it's pretty pricey. I've never known anyone to claim for theft on it, though. People seem to mostly use it for racing crash damage.
As for security., Imagine carrying around a little lock box with $10,000 inside and clearly marked on the outside of the box that there might be $10,000 inside. You have to leave it chained up outside places of business and strapped to the top or back bumper of your car when traveling. Sooner or later it will probably be stolen..