だけのことはある

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).

• 彼かれは毎まい日にち練れん習しゅうしているだけのことはあって、本ほん当とうに上手じょうずだ。

  He practices every day, so it's no wonder he's really good.

• 高たかいだけのことはあるね。この靴くつはとても履はきやすい。

  These shoes are worth the price; they're very comfortable.