I think you're looking at this with a 20th century viewpoint. There doesn't seem like there'd be a lot of physical matter that an advanced civilisation might want to pirate. Perhaps some form of exotic matter, like a black hole, might fit the bill, but that would be particularly hard to steal because everyone could see where you were taking it.
Sure, but even today, raw material resources tend not to be the sort of things criminals target directly. You rarely get thieves trying to steal lumber, or iron ore, for example, because they have a low price-to-weight ratio.
