Because not worth the effort. He has a athletic department to run, not a souvenir shop. Different from the flood floor which was essentially destroyed and worthless. Selling it whole is the right move assuming they get a buyer. A buyer might have a court use for it. Buying it cut up for souvenirs is lot of work (pickup, transport, storing, cutting and separating the surface layer, marketing, selling, shipping etc). Think you'd have to get the floor for free to make it work. Plus it's already been done once only 10 years ago.
1993 was 10 years ago?