〜がいあって

Pattern: 〜がいあって
Level: N1
Meaning: to make ... worth doing, rewarding
Attaches to: Verbた-form / Noun + の
Nuance & register: Used when an effort or action yields a satisfying, positive result.
Example: 苦労したかいあって、希望の大学に合格できた。 It was worth all the hard work; I managed to pass the entrance exam for my desired university.
Easily confused with: 〜かいもなく