Pack your comics very well. I always pay attention to that in a sellers feedback. If they don't, no way I'm risking buying from them.
You can ship the comics media mail unless it's going to Hawaii or Alaska. Then send Priority because it takes too long. I've had shipments get to a buyer in CA from me in VA in two days frequently.
Service doesn't necessarily matter as much as how you pack the books.
Am I going to learn karate?
The Dane Cook of martial arts? No.