By sale

The average price for a “rare” is $5.09. The highest average price for a rare card is $9.48 (Neopets), and the lowest is $0.50 (Raw Deal). Collectively, these numbers indicate that although Yu-Gi-Oh! is more common among online discussions (51%) than Magic: The Gathering (7.7%), their eBay secondary market value may tell a different story. Perhaps including a greater number of message boards would provide a different observation.