This is the Wal-Mart versus the Mom n' Pop Store all over again. So many businesses have gone under because Wal-Mart has moved to town and no one seems to care because they can get their tube socks for 50 cents less now.
Here's what I would do if I were you. I would start a comic book blog site and use something like e-junkie.com to fulfill your shopping cart and inventory needs. Blog your heart out about what you love...comics. Build the blog as much as you can by getting backlinks through directories, social bookmarking, article directories and getting links from other comic bloggers. When your site outside of ebay gains page rank and search result position...you can then link to your ebay listings and get traffic from something more than just the ebay browsers.
Plus you'll have a lot of fun building a website about something that you like. Once the blog gets page rank, and thus linking power..then you can backlink to your ebay listings and have more success.
I think the days of relying on just ebay traffic to support a successful selling enterprise are over and we'll have to rely on other internet tactics to make sales. The one part about ebay I like these days is the fact that they provide rss feeds for your store and auction listings. I'm glad I spent the last year figuring out how to exploit that technology...
James