expression, godan verb (-ru, irregular)
not ... for nothing; no wonder; worthwhile
Expresses that a result or quality is well-deserved or expected given the effort, ability, or circumstances. Often follows a clause explaining the reason. The phrase can be used positively (praise) or neutrally (explanation).
彼は毎日練習しているだけのことはあって、本当に上手だ。
He practices every day, so it's no wonder he's really good.
高いだけのことはあるね。この靴はとても履きやすい。
These shoes are worth the price; they're very comfortable.