If somebody does an unnecessary good deed - do they do it because they are religious?

My cousin used to volunteer as a martial arts teacher at a community centre because my dad thought the experience on her resume would help her get into college

During her last teaching session a rich elderly couple bought her a pair of very expensive shoes as a thank you gift for teaching them free martial arts

Wonder what motivates somebody to buy a gift for somebody they will never see again
If somebody does an unnecessary good deed - do they do it because they are religious?
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