About the question whether you should sell it yourself on ebay, use an ebay consignor (e.g., PWCC, Probstein) or go to an auction house, there are pros and cons for all of them.
If you sell it yourself, you can just put the item on a BIN, and wait as long as you want until you get your price, changing your BIN price as needed.
If you worry about buyer fraud, then let an auction house or ebay consignor deal with the issue. If you are selling the card via auction, it is almost better to let the consignor take care of it. For example, PWCC rates for $5K+ graded cards is just 8%, which includes all ebay and paypal fees. If a card sold for $5000, then would come out to $400. If you sold this card on ebay yourself, and did not have an ebay store (and were not a Top Rated seller), your ebay final value fee would be $500 and your Paypal fee would be $150, so your total fees would be $650. If you had an ebay store, your FVF would be $250 and Paypal would be $150, so the total fee would be the same $400 as PWCC, but your auctions would likely be viewed much more. (Top Rated sellers have an additional 3% discount.)
The fees are greater when you use an auction house through their buyer's commission and seller fees. However, if you have a very expensive item or need very specialized buyers to see your listing, then you should probably use an auction house. Auction houses typically list their items for a much longer period than ebay auctions, so there is a greater chance that the buyers who would be interested in your auctions will see it. They often have print catalogs or publicize their auctions much more widely, so there is a chance the final price will be higher. In addition, auction houses usually vet their buyers much more than ebay (which does no vetting), so you usually don't have any deadbeat buyers (although it still happens on occasion). Of course, if your item is very generic and not "special," it could get lost among all of the other prestigious items in the auction catalog and sell for less than it would on ebay.
Good luck on whatever you decided to do!
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