the.com/money pit

A home improvement project that improves nothing but your bank's quarterly earnings.

means A house, project, or venture that keeps demanding money with no end in sight, swallowing cash the way a bottomless pit swallows anything dropped into it.

from Literal money pits are old folklore treasure-hunt sites — most famously the Oak Island 'Money Pit' in Nova Scotia, a shaft diggers have poured fortunes into since the 1800s chasing rumored buried treasure that never quite surfaces. The phrase jumped into everyday speech as a joke about any endeavor, especially a house, that eats money the same way: you keep digging, keep spending, and the payoff never comes. The 1986 Tom Hanks film 'The Money Pit,' about a disastrous home renovation, cemented the term in its modern domestic sense.

origin
term predates the 1986 Tom Hanks movie
classic example
any house with charming historic plumbing
true cost rule
double the contractor's first estimate, then add more
also applies to
boats, startups, and exes
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