> It very much is. Not 1:1, but it's absolutely correlated. I've made several purchases for things that I tried to pirate and couldn't find.
An ancedote is not the same as data.
(Legal) libraries had an effect of increasing sales, much to the surprise of everyone when they were first introduced. Its entirely possible that piracy could have too. Or maybe it doesn't. Who knows. I think the effects are non-obvious enough that actual studies are needed to know what the actual affect is.
I, on the other hand, have never purchased anything I was going to pirate if I couldn't find it. So for me it definitely is not correlated. If I couldn't find it I just moved on. I tend to pirate nice to haves.
Everybody's different. For me, an inverse correlation happens: libgen etc. act as a bookshop where I can freely browse and evaluate stuff before I buy. So I want to make sure I'm not cheated.
Sometimes the brand is enough, i.e. I know by experience that if a book is from Manning I can trust it, whereas if it's from Packt it's hit-or-miss-but-probably-miss. Self-published ones? 90% are worthless, 1% are gems with the rest on the verge. You can't really know this from reading a sample chapter or the ToC.
It very much is. Not 1:1, but it's absolutely correlated. I've made several purchases for things that I tried to pirate and couldn't find.