細ほそ客きゃく

noun

frugal customer; poor spender

Slang used in business or service contexts to describe a customer who spends little money, often with a slightly derogatory nuance.

• あの店みせは細ほそ客きゃくばかりで、なかなか儲もうからない。

  That shop only gets frugal customers, so it's hard to make a profit.