I mean, the reason it won't hurt sales is because piracy doesn't actually hurt sales, and studies have shown piracy can increase sales.
Basically, most people willing to pirate games weren't going to buy the games in the first place^[video games are a luxury item and especially with the economy seeming to trend down and game prices definitely shooting up a lot of people aren't going to have the means to afford playing], but there are going to be a percentage of converters who like the game enough to buy through official channels.
And there's a cultural currency that comes from being a popular piracy target, too, as that means more people (who have played it) are talking about the game and are likely to convince others to try it, which is going to bring in more customers. Basically what happened with Game of Thrones, when they (I think it was the director?) boasted about being the most-pirated show in the world. In that way, you can get sales out of people who never even purchased your product.
EDIT: fixed costumer typo