> who would are more inclined to spare the expense of purchasing said licenses, since they're not personally buying it themselves

They often need to "purchase" the license themselves in the sense of convincing someone higher up to buy it - so they're spending their time, which is still a sort of expense.

Also, piracy in companies is often just honest people who are in a bit of a hurry and need this software running on some other PC right now, or just want their colleague to give it a quick go (but then they end up using it all the time). Copy protection helps keep those honest people honest.