Probably worth buying for the patents, sales channels and manufacturing bits. Cut most of software dev and turn them into an Android phone maker...maybe specialize on low powered, ultra long battery life phones of something.
Not well. They're sluggish, and no features past Gingerbread are supported.
If you don't want to submit to BlackBerry World, you would need to sideload the app. You still need to sign it with a BlackBerry key.