If the creator wants to distribute it for free that's fine, but one cannot argue that when it comes to something like data it's okay to choose how much you want to pay because "you wouldn't buy it for more than that." You can't have your cake and eat it too.
I don't think this problem is worth the pain of DRM, but it is a problem nonetheless.
I think the disagreement is over how much of a problem it is. It's not like piracy is a new problem.
It's just that:
1. The Internet has made distribution trivial.
2. The price-point is now 'free' instead of 'cheaper than the original, but still costs money.'
3. Storage is now trivial. It's easy to pirate a 1000 PDFs of actual books. It's less trivial to deal with 1000 actual books, even if they are free.
In general though, when people are arguing that the pirates wouldn't have paid for the product at any price, they are attempting to dispel the myth that 1 pirate download = 1 lost sale. It's this calculation that is used time and again to 'prove' how much of an issue piracy actually is.
I don't think this problem is worth the pain of DRM, but it is a problem nonetheless.