Infinite density doesn't fit right with me, black holes will eventually evaporate into nothing and spew their matter everywhere, so something of infinite density cannot be, especially if the planck scale is true, so what do you think is there? Would it be more appropriate to call a black hole a dark star? Considering they act like stars and sometimes emit gamma ray bursts? I'm guessing all the matter gets compressed to almost planck density, then as the black hole gets larger, so does the dense matter in the middle, pushing the event horizon into larger and larger radius.