Worth making a meal with 〜甲斐がある

Grammar Explanation: Worth it with 〜甲斐がある

Rintaro’s mother is overjoyed when her son has friends over for the first time in his life. She prepares a large meal for them to eat.

絢斗(あやと):: 「すごく美味(おい)しいです！」; “This is incredibly delicious!”
杏子(きょうこ):: 「よく食(た)べるわね！　作(つく)りがいがあるわー」; “You sure do eat a lot! It makes cooking worthwhile!”

Key Points

1作(つく)りがいがある = “cooking feels rewarding”

Here, 作(つく)りがいがある means her effort in cooking feels worthwhile because everyone is eating so enthusiastically.
The nuance is not just “worth doing” in general, but “this feels rewarding because I can see the result right now”.
Reusable pattern: Verb stem ＋がいがある “it is rewarding to do / worth doing”.
The previous line, よく食(た)べる (“you eat a lot / you eat well”), sets up the reason 作(つく)りがいがある feels true here: people enjoying the food makes the cooking effort pay off.

2わね and わー give the line a warm, delighted tone

わね sounds like a friendly observation shared with the listener.
The final わー stretches the feeling out and makes her sound genuinely pleased rather than formal or flat.