Why so cheap?

This is a coin I won on Ebay the other day LINK This same seller had a lot of common dates in first generation 64 holders ending around the same time. His pictures weren't that great, but I was surprised at how little everything brought. Is the PCGS price guide very high on such coins, or did that seller get slighted?
I collect circulated U.S. silver
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Comments
The 1881-S dollar and other San Francisco mint dollars from this era are very common in MS-64 through 66. In fact MS-64 is really a "low" grade for this date. MS-64 coins are sort of a drug on the market. They have a minimal upside, and are not crack-out candidates even if an upgrade is a "sure thing" because you can't make enought from an upgrade to make it worthwhile. AND since MS-65s are pretty common, many collectors and smart speculators will say, "Why bother with the MS-64s?"
The seller may have bought a deal on these and wanted to turn his money over quickly. These coins don't sell that quickly at the shows because they are so common, so if he could make a couples bucks a piece on them quickly, perhaps that was the motive.
I don't know what the PCGS price guide says about this coin, but if it's much over $55 or so, it's too high.