1981-S PCGS MS66 SBA Pop Top?

I was just curious. I noticed 1981S PCGS MS66 SBA DOLLAR POP 73/0 TOUGH! on eBay. The PCGS coin price guide lists this one at a mere $98. Why is the opening bid $628?
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Comments
Jeremy
$628 is probably too high, but the example in the auction looks impressively clean from the photos. Maybe a touch of strike weakness though.
believe this is among the cleanest of all '81-S's.