Would it be cheaper for me to open a Ebay store rather then tons of auctions?

I sell everyday on Ebay. With as many as up to 100 auctions going on one day. I was wondering if it is cheaper for me to just open an Ebay store? If so, can someone give me the breakdown ( examples of cost doing it either way)?. To be honest, what I pay in listing and final value fees make the whole thing not seem worth it?