Most nursery pots get tossed because I grow in S/H pots. I may save a few, if they are good quality, because I do grow a few plants in a CHC mix.
When I repot from S/H pots, I wash them, store them until I have a few saved up, then soak them in bleach water so I know they are safe to reuse if I need to repot something else. S/H pots are just too expensive to toss into the trash.