Why do T206 Brown Hindu Backs sell for so much?

[wazoo]

Recently on EBay, there have been several Hindu Brown T206 cards. They have sold from a range of $250-$746. My question is why so much, when Sovereign 460 cards and Carolina Brights cards are around the same area of scarcity, if not harder to obtain, yet these Hindu cards sell for so much more? The card that sold for $250 was in poor condition, with much paperloss and creases. The second one sold for about $450. This one was in about good condition. Lastly, the one that sold for $746 graded a SGC 3. The card was just a regular common, yet it sold for so much money. If anyone has information about why these Brown Hindu backs sell for so much, please let me know.

[CMIZ5290]

While brown hindus definitely sell for more than sov. 460's, i think it's pretty close compared to carolina brights, especially recently.