Yup, I've heard that, too. But that's typical with sample libraries in general and loop libraries in particular. They get pirated because a) it's easy to do, and b) the demographic for loop users is heavily weighted toward the "everything's free on the internet" generation.
Still, given the extremely low cost of doing business for online software distribution, it's hard to imagine somebody not being able to make at least a modest profit from it. Amazon has plans with no monthly minimum fee for bandwidth, half a cent per 1,000 transactions and 10 cents per gigabyte for storage. Compared to conventional retailing, it's free money!
EDIT:
This may be the thread referred to above. It's a long explanation but worth the read. In it, NVA's owner talks about the theft of one of his most ambitious and expensive (and most popular) libraries. He also reveals how small the monetary rewards are for the amount of work that goes into creating a sample library.