If you're supplying digital content as a business, then usually that isn't your real problem. They weren't going to give you any more money anyway, and with the legal framework being as it is in most places today, it's frustrating to see your content ripped off but not actually worth doing much about it. Meanwhile, your real problem is probably people who will casually copy and share your content, because even if the multiplication is relatively small, those are potentially still reaching people who would otherwise pay for a legitimate copy.