My cartilage piercing doesn't hurt at all, is that a good thing?

Not a good or bad thing. It's just how your body is dealing with it.

Stop twisting your jewelry. That drags in crust and bacteria and tears up the inside of the piercing. And unless the cleaning stuff is a sea salt solution of 1/4th of a teaspoon of non-iodized sea salt to 8oz of hot water you need to stop using that as well. Do the sea salt soaks twice a day for 5-10 minutes each soak.

If you were pierced with a gun you really should take it out and let it heal continuing to do sea salt soaks twice a day until it closes completely. Your piercing is going to take double the healing time as normal (so 1-2 years) to heal due to the trauma of the piercing gun and the jewelry isn't even appropriate for a healing piercing. Proper jewelry won't fit into that hole either.

Well, my guess would be: Pain, not good... No pain, Good...

Unless you really like pain...