Originally Posted by Apache
Buying from a pirate site does not necessarily make you a pirate. It can just mean you are gullible.
You have obtained copyright material without the authorisation of the copyright holder. Gullible, perhaps, but still a pirate.
If you're going to end up with pirated books, it's better not to give your money to crooks while doing so.
It is, of course, much better to only obtain ebooks with the authorisation of the copyright holder.