You obviously haven't been paying close attention to this board realist. They have an answer to that one, as well as everything else.
Subsequent to the botched trial(I think after our huge payout, it is safe to call it that again), we uncovered some additional information about bavi's moa which makes us worth multiples of whatever Abbvie was allegedly ready to pay. Please do not concern yourself with the ever declining pps, that has nothing to do with anything. Gild's $24b wouldn't be enough to buy a fraction of this company according to many here.