Why did the cantervile ghost resolve to give up the point of the blood-stain?

The Canterville Ghost resolved to give up the point of the blood-stain because he realized that his efforts to haunt the Otis family were in vain; they were not frightened by him and treated him with indifference. Additionally, he began to appreciate the family's kindness and acceptance, which led him to reflect on his own loneliness and desire for companionship. Ultimately, he found that his haunting had become more of a burden than a source of pride.