I must agree, in a normal case a get should not be a bargaining Chip, but there are cases were its 100% k, like in a case were the wife has a rich family behind her and managed to get full time custody to kids through laywers that he cant afford, so then you fight with all you got.
Friend of mine, married with 1 kid, lived in usa. After divorce the father had him deported and banned from the u.s. He cant see his kids unless she brings them to him for a visit. She refuses... whats he supposed to do?
G-d has his reasons, that a wife cant give a get. Even Beth din doesnt have the Power, so i guess sometimes not giving is a valid option...