What does the library do with Blu-ray discs?

When they buy a 2-for-1 item that includes DVD and Blu-ray, they do the smart thing and just send them both out. (If they’re using DVD-style packaging. Blu-ray packages are repackaged.)

RFID-tagged DVD of ‘African Cats’ on left side, Blu-ray on right

I don’t see any reason to collect Blu-ray-only titles. Do you?