Prevention is far better than cure for wire marks.
@Adair M is right that wire does not need to stay on as long as most of us seem to think. Taking wire off often takes longer than putting on so we tend to put that job off. Better to be disciplined and get on with it to prevent this sort of scarring.
In commercial operations it can be difficult to find the time. They may also have purchased these from other sources so sometimes deceased estates and growers cutting back larger collections where trees have been neglected so the wire marks are sometimes even beyond the control of the nursery. That does not excuse bad wire marks and I think prices should reflect faults as well as good points of any bonsai but, in the end, if they an sell trees at a price they would be foolish not to.
Also echo the idea of regrowing branches on many bonsai. We tend to develop structure and ramification too quickly and use shoots with long internodes for basic branching. While quick to get a 'bonsai' it eventually becomes obvious the tree will never be first class. I have had to bite the bullet and remove and regrow branches on most of my earlier tridents and JM. The first is really frightening an the years spent regrowing decent branches is frustrating but the result is worthwhile. Doing it right first time is way quicker and less stress however knowing the pitfalls and how to do it is something that appears experience alone can teach.
