Stuff planets are made of..
I watched a time lapse film of several stars orbiting a black hole - the orbit was highly elliptic though. If this can happen why not planets? I'd imagine black holes could rob planets from star systems and probably gobble a lot of them up as well. Who would really know if those stars were formed from being close to a black hole or not - many questions here. I know it is realistic to assume no stars and only planets can form around a black hole orbit, but who is to say they couldn't get so massive they'd graduate to star size?