This market is both wonderful and terrible.

It's wonderful because demand is so strong. For example, my keyword research tool predicts 21,625 searches on this subject for the next 24 hour period. Of course, that's only an estimate and not to be taken literally, but it does indicate terrific demand. Always a good thing for an eBay seller.

It's terrible, though, because of that fan passion, which means they know lots of places to find competitive items. If your prices aren't good - or even the best - or you haven't added value in some way, you won't be making many sales.