Well most of the Devs are powerless against piracy so rather than wasting time or stress over it, they just leave it be hoping for gathering more feedback or use it as some sort of advertising or any other way to turn piracy into "positive value" rather than "negative value"
Definitely. Indie games can never hope to compete with AAA publishers when it comes to marketing. That's why one could potentially argue that piracy is an unsung hero in bridging that divide. A smart Indie dev can look at it as a cheap alternative to allocating funds to promotional media because, just like it, piracy promotes your product. Yes, I know it effects sales but how many of those sales would it take to cover the costs involved in marketing anyway? Food for thought at any rate.
At the end of the day, were it not for piracy, I would never have found so many gems on this site I would eventually buy for myself and occasionally for my friends. These include the likes of both Sinisistar games, Anthophobia, The Agnietta, etc.