Can someone please educate me on this Mike Schmidt PSA 10 card?

While performing a search on eBay, I came across this 1988 Leaf Mike Schmidt PSA 10 card. I was a little shocked by the closing price, but then again, I noticed that the pop on this card is very low - 4 if I recall correctly.
Is the pop low due to the production run of the Leaf series for this particular year, the condition of the stock, or interest in the card (or a combination of any of the aforementioned reasons)? I suppose it could also be an avid collector looking to complete a set.
Thanks in advance.
Is the pop low due to the production run of the Leaf series for this particular year, the condition of the stock, or interest in the card (or a combination of any of the aforementioned reasons)? I suppose it could also be an avid collector looking to complete a set.
Thanks in advance.

Remember these Chuck Norris Facts
1. When Chuck Norris does a pushup, he isn't lifting himself up, he's pushing the Earth down
2. According to Einstein's theory of relativity, Chuck Norris can actually roundhouse kick you yesterday
3. There are no such things as lesbians, just women who have not yet met Chuck Norris
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Remember these Chuck Norris Facts
1. When Chuck Norris does a pushup, he isn't lifting himself up, he's pushing the Earth down
2. According to Einstein's theory of relativity, Chuck Norris can actually roundhouse kick you yesterday
3. There are no such things as lesbians, just women who have not yet met Chuck Norris
Just asking in case I missed something while away.
Steve
Steve