a mug's game

(British informal)

an activity that will not make you happy or successful

Usage notes: A mug is a person who is easily deceived.

Working for a big company is a mug's game - if you want to make money you need to start your own business.

Name	Pronounced	Usage
Raf	RAHF	Dutch
Evan	EV-ən (English)	Welsh, English
Daley	DAY-lee	Irish, English (Rare)
Saburo	sah-boo-ṙo:	Japanese
Rubinho	-	Portuguese
Katee	KAY-tee	English (Rare)