Arma has a soothing voice that sounds somewhat like either college literature professor or mental therapist, or one of those guys that are paid to read audiobooks.
Seriously though, in my 4 years or so of profiteering, I have only bought a key once, and it was from CS:GO.
If you’re looking to make a buck, do so either by mastering the art of trading up, or by buying and selling items directly. Keys are often a bad choice for buying with the intention of profiteering due to their slim profit margins, though they are often used as trade currency so it’s not uncommon to receive or use it in a trade.
That being said, to address your original question, I’m not the type of guy to unbox things, so I don’t know concretely, but in my experience all games are the same in that it’s not really worth it to buy a key.