for all (one) is worth
1. To the greatest degree or extent of one's ability; to the utmost; as vigorously or intensely as possible. When I saw the police approaching, I ran for all I was worth.
2. As much as one has available or to offer. If you can't get her to sign a prenup now, that guy is liable to take her for all she's worth if they get divorced.
for all one is worth
1. To the utmost of one's power or ability, as in Coming onto the homestretch she ran for all she was worth. [Second half of 1800s]
2. for all or for what it's worth ; for whatever it's worth. Even though it may not be important or valuable. For example, Here's my opinion, for what it's worth, or For whatever it's worth I've decided to take the train. [Late 1800s]