This is just as stupid as the other stuff Sears has done (or not done) over the last 20 years to slowly go out of business. Sears and K-mart stores are "retail" land uses and are located on land appropriate for retail. This means that there is a) a sizable nearby population base to draw customers from, b) access via high-volume roadways, c) lots of onsite parking, d) other retail nearby to draw retail customers, etc.
All of the KMart stores in my area - and I include in this the ones that are currently closed, which is most of them - are located in parts of town that used to be high-traffic retail but aren't anymore. The other businesses in the area are mostly commercial services and specialty. One I can think of that is still open is pretty much surrounded by large car dealerships. The KMart where I had my first part-time job closed over a decade ago. The building is now used as a warehouse for a construction supplier. Other businesses in the area is a farm equipment dealership, an auto parts store, and some place that I think sells well drilling equipment.
My point is that in my, admittedly anecdotal experience, the KMart stores are no longer in prime retail locations. It certainly makes sense for Sears to say, what the heck can we do with all these buildings we own?