I have met precisely one person in real life who does this, and he was far enough on the Autism spectrum to receive a government-funded integration aide for the first 6 years of school.
Every other person I know pirates because it's easier than acquiring the real product, they can get a pirated version before the official version is released, or they just simply want to save money.
I personally pirate because I can't be bothered looking through 6 different streaming apps to see which one has Terminator 2 on it. Apparently I'm not alone in this regard; piracy has started to rise again since everybody pulled their content from Netflix.
Yes, it's just anecdata, but I would be shocked if more than 5% of pirates intended to purchase genuine copies of the media they actually liked.