Please remember to use your bonus codes and CTC codes. I don't know about others, but myself, i will reuse codes that i see unused, so when you receive a credit gift, activate the code (you can use your credits anytime, they don't expire, but codes do). I see codes unused that are very very old, i will consider them abandoned/forgotten, and give them to other people. When you active a code it turns into credits, or creatures, or whatever that code is for, things that never "expire".