If by "touched $2100" you mean "sold for $1600 or less", then, yes, you are correct.
That book in that grade has had exactly one sale above $2000 in the last 7 years (according to GPA) - out of 100s of total sales. The seller is smoking crack if he thinks he'll get $2100 for it here.
My bad; I did a quick ended items search on eBay. There are two sellers who are "trying" to get $2k for the book. I didn't realize that they didn't actually sell for that. I'm not trying to defend the seller's asking price, just assumed there was a good reason for the price. I guess I was mistaken.
I wonder if that book is one