Guitars, for professional players, are tools used to generate income. In order to do this, they are used in bars, cafes, restaurants, at events (weddings, etc.) and of course in, studios. Being moved around so much, they will get bumped, and they will get taken from homes, to cars/vans/trucks/trains/airplanes/buses, and into the place where they are to be played, not all of which will be at ideal temperatures, so nitro finishes will crack/craze. This doesn't mean that professional players are intentionally damaging guitars, this is just an accumulation of things that happen when guitars get taken on the road. This is true of Guilds, Martins, Gibsons, and a host of other guitar brands.
Not all guitars will spend their entire existence in the comfort of somebody's living room, and life on the road can be tough.
Kostas