Not strictly true...a recovery truck will take most vehicles without too much bother..and what looks more normal than a fellow in a high vis winching a vehicle on to the back of a lorry?..even with an alarm going off in broad daylight people wouldnt bat an eyelid.A tracker won’t stop your van being stolen, a Ghost will.
I'm not picking on ghosts or immobilisers in general, just saying if you have something of high value then you have to consider all options.