Well you've touched on 2 very interesting points.
Taking a step back, from the business standpoint I understand that piracy affects revenues which fucks everybody over. So piracy is bad, because piracy is theft. Sorry, but that's how it is.
However, from a consumer standpoint, piracy rocks. The internet makes things which should cost money, free. And free is better than pay, every single fucking time.
Thus, I understand that piracy does in fact cost people money because I can confirm from multiple anecdotal sources that piracy does in fact impact sales. Because once you pirate something, the motivation to pay for it later decreases by a significant amount.
Sure, it may lead to SOME PIRATES spending SOME MONEY on said pirated product later down the line, but take a serious glance at any one of the major piracy sites - you think those pirates will buy that shit later? hell take a look at this very forum, you got peeps that pirate because "fuck the MPAA and their DRM bullshit". Fuck that shit, don't try to pretend you're fucking robin hood, taking from the rich and giving to the poor. You just want what you want for free because the internet gives it to you for free.
FWIW, I don't pirate music or movies. But that fucking Mayweather fight, fuck it, I aint giving him a penny. I stole that fight, cuz free on the internet > $50 cover at the local bar.