I heard this at work last week and thought it was hilariously funny:
Marry for money—earn every penny.
It was attributed as a Yiddish proverb but a quick Internet search failed to confirm that claim. No matter.
Besides the direct interpretation it would seem it applies to other areas as well, such as choosing your career and employers.
One of my best friends used to say, “Never marry for money…Hang around rich people until one of them falls in love!”