Not sure a thief would need to break it, but it would definitely be damaged which would leave no question about what happened. If I was an owner looking to sell, I might think it'd be better not to have it at all. EDIT: Missed a point here - I don't know if a potential thief could hot-wire the truck with out going into the steering column. Either way, a thief isn't always an expert and isn't concerned too much about screwing things up.
In any case that alone wouldn't be a deal breaker for me, and as Andre pointed out it's a cheap fix. Will you get a chance to see it in person before buying?